ORCID Profile
0000-0001-6131-3906
Current Organisation
Australian National University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanotechnology | Nanomaterials | Functional Materials | Quantum Optics | Nanoscale Characterisation | Functional materials | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Materials engineering | Quantum Physics | Condensed Matter Physics | Nanophotonics | Nanotechnology | Photonics optoelectronics and optical communications | Nanomanufacturing | Nanoscale characterisation | Energy Generation, Conversion and Storage Engineering | Microelectromechanical Systems (MEMS) | Quantum Information, Computation and Communication | Photonics, Optoelectronics and Optical Communications | Nonlinear Optics and Spectroscopy | Nanoelectromechanical Systems | Nanotechnology not elsewhere classified
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in the Physical Sciences | Expanding Knowledge in Technology | Integrated Circuits and Devices | Solar-Photovoltaic Energy | Integrated Systems | Energy Conservation and Efficiency not elsewhere classified | Management of Greenhouse Gas Emissions from Information and Communication Services | Hydrogen Storage | Hydrogen-based Energy Systems (incl. Internal Hydrogen Combustion Engines) | Expanding Knowledge in Engineering |
Related Links
Publications
Radioisotope-powered ion gauge with super high stability, long life, and large sensitivity range from ultrahigh vacuum to high pressure
Publisher: American Vacuum Society
Date: 09-2010
DOI: 10.1116/1.3483579
Abstract: The authors report the radioisotope-powered ion gauge (RPIG) using the safe, low activity, planar radioactive N63i beta thin-film source as the cold cathode. RPIG has both high stability and long lifetime with N63i half-life of 100.1 years. The authors experimentally demonstrate an ultrahigh sensor dynamic range, from high vacuum (10−6 Torr) to high pressure (103 Torr), which is the largest sensitivity range among all the reported pressure sensors. With high source stability independent of temperature, and its self-powered nature, RPIG is a promising candidate for pressure measurement, which needs extreme low temperature or high temperature, in microsystems where power consumption and system complexity need to be minimized.
Observation of Robust Interlayer Biexcitons in Twisted Homobilayer Superlattices
Publisher: Research Square Platform LLC
Date: 15-05-2023
DOI: 10.21203/RS.3.RS-2774598/V1
Abstract: Moiré superlattices are formed by stacking 2D materials with a twist angle and have recently gained attention as a platform for investigating the interactions and correlations of moiré-trapped interlayer excitons (IXs). However, understanding these excitons remains challenging, as theoretical predictions suggest the existence of both parallel and antiparallel dipole-dipole interactions, while only repulsive interactions with a parallel configuration have been experimentally observed. Here, we investigate the localization of strain-induced moiré interlayer excitons in twisted transition metal dichalcogenide (TMDC) superlattices. Our results reveal that modulating the moiré trap in strain-engineered homobilayers leads to a higher density and emission efficiency of IXs, while also enhancing dipole-dipole interactions. In particular, we observe a transition in the nature of the moiré interlayer exciton-dipole interaction from repulsion to attraction in a twist-angle homostructure, resulting in a stable interlayer biexciton (IXX) phase with an antiparallel configuration, which had only been theoretically predicted before. Moreover, the moiré trap in homobilayers can be modulated by adjusting the spacing of the Au nanoarrays, which enabled us to achieve IXX emission up to 150 K, the highest temperature reported to date. This breakthrough is expected to pave the way for the observation of a Bose-Einstein condensate at room temperature. Our findings provide new opportunities for studying correlated many-body systems and have implications for developing novel optoelectronic devices and controllable nonlinear optics.
Interactions between Fermi polarons in monolayer WS2
Publisher: Springer Science and Business Media LLC
Date: 18-10-2022
DOI: 10.1038/S41467-022-33811-X
Abstract: Interactions between quasiparticles are of fundamental importance and ultimately determine the macroscopic properties of quantum matter. A famous ex le is the phenomenon of superconductivity, which arises from attractive electron-electron interactions that are mediated by phonons or even other more exotic fluctuations in the material. Here we introduce mobile exciton impurities into a two-dimensional electron gas and investigate the interactions between the resulting Fermi polaron quasiparticles. We employ multi-dimensional coherent spectroscopy on monolayer WS 2 , which provides an ideal platform for determining the nature of polaron-polaron interactions due to the underlying trion fine structure and the valley specific optical selection rules. At low electron doping densities, we find that the dominant interactions are between polaron states that are dressed by the same Fermi sea. In the absence of bound polaron pairs (bipolarons), we show using a minimal microscopic model that these interactions originate from a phase-space filling effect, where excitons compete for the same electrons. We furthermore reveal the existence of a bipolaron bound state with remarkably large binding energy, involving excitons in different valleys cooperatively bound to the same electron. Our work lays the foundation for probing and understanding strong electron correlation effects in two-dimensional layered structures such as moiré superlattices.
Recognizing Faces
Publisher: SAGE Publications
Date: 06-2017
Abstract: The idea that most of us are good at recognizing faces permeates everyday thinking and is widely used in the research literature. However, it is a correct characterization only of familiar-face recognition. In contrast, the perception and recognition of unfamiliar faces can be surprisingly error-prone, and this has important consequences in many real-life settings. We emphasize the variability in views of faces encountered in everyday life and point out how neglect of this important property has generated some misleading conclusions. Many approaches have treated image variability as unwanted noise, whereas we show how studies that use and explore the implications of image variability can drive substantial theoretical advances.
Power generation for wearable systems
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03911J
Abstract: The mechanisms, figures of merit, and systems for wearable power generation are reviewed in this article. Future perspectives lie in breakthrough technologies of fiber electronics, fully printable, flexible SoC, and IoT-enabled self-awareness systems.
Hybrid Alkali Salt Catalysts‐Promoted CVD Growth of 2D MoSe2–WSe2 and WSe2–MoSe2 Lateral Heterostructures
Publisher: Wiley
Date: 17-06-2023
Abstract: A scalable growth of atomically‐thin 2D transition metal dichalcogenides (TMDs) with defect‐free large‐area surfaces is crucial for developing high‐performing optoelectronic devices. Herein, a method to grow large‐area, high‐quality MoSe 2 monolayers, MoSe 2 –WSe 2 , and WSe 2 –MoSe 2 lateral heterostructures using molten salt‐based chemical vapor deposition (CVD) is systematically reported. First, effects of isolated inorganic (sodium chloride (NaCl) and sodium nitrate (NaNO 3 )), organic (Perylene–3,4,9,10–tetracarboxylic acid tetrapotassium salt (PTAS), mixed inorganic (NaCl/NaNO 3 ), and hybrid organic–inorganic (PTAS/NaCl/NaNO 3 ) salt catalysts on the CVD growth and optoelectronic quality of MoSe 2 monolayers and their lateral heterostructures with WSe 2 in MoSe 2 –WSe 2 and WSe 2 –MoSe 2 assemblies are investigated. Results show that molten salt catalysts (NaCl/NaNO 3 and PTAS/NaCl/NaNO 3 ) support high‐quality, large‐area growth of MoSe 2 monolayers with low defect density. The mixed inorganic salt supports growth of MoSe 2 –WSe 2 lateral heterostructures but not their counterpart. Meanwhile, WSe 2 –MoSe 2 lateral heterostructures are optimally grown, supported by the hybrid organic–inorganic salt. These results are ascribed to the difference in the associated kinetic and thermodynamic mechanisms for the growths of MoSe 2 and WSe 2 as starting materials. Last, it is confirmed that optoelectronic quality of realized heterostructures and monolayers is improved compared to their mechanically exfoliated counterparts. The obtained high‐quality, large‐area 2D TMD heterostructures can be useful for various optoelectronic applications.
Enhanced interactions of interlayer excitons in free-standing heterobilayers
Publisher: Springer Science and Business Media LLC
Date: 12-10-2022
DOI: 10.1038/S41586-022-05193-Z
Abstract: Strong, long-range dipole-dipole interactions between interlayer excitons (IXs) can lead to new multiparticle correlation regimes
Two-dimensional multiferroics
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1NR06598J
Abstract: 2D multiferroics achieve multiple functions and new mechanisms through magnetoelectric, piezoelectric, and magnetoelastic coupling phenomena, opening up new research avenues.
Self-powered near field electron lithography
Publisher: American Vacuum Society
Date: 11-2009
DOI: 10.1116/1.3253545
Abstract: Electron beam exposure is the tool of choice for highest resolution lithography but suffers from the low throughput during serial beam writing [T. Ito and S. Okazaki, Nature (London) 406, 1027 (2000) R. F. Pease and S. Y. Chou, Proc. IEEE 96, 248 (2008)]. The authors designed and developed a low-cost self-powered near-field electron lithography (SPEL) technique, which utilizes the spontaneously emitted energetic electrons from beta-emitting radioisotope thin films. This approach enables massively parallel e-beam lithography, with potentially arbitrarily large concurrently exposed surface area, controlled by the size of the radioactive source. This method potentially eliminates the need for vacuum systems and the electron focusing column as needed in the existing electron beam lithography systems. This will greatly simplify the overall lithographic system and reduce the cost of deep-subnanometer lithography. In SPEL system, emitted electrons are spatially blocked using a nanostenciled micromachined mask that is placed in proximity to an electron sensitive resist on the silicon substrate (Fig. 1). The electrons that are not blocked, impact and enter the e-beam resist, along with secondary electrons generated by primary electrons impacting the sidewalls of the stencil layer. Using three-dimensional 3D Monte Carlo (MC) simulations of electron paths, the authors show that the critical dimension (CD) in the system could be down to 20nm with 14.9keV electrons emitted from Ni63. The 3D MC simulation considered both elastic scattering and inelastic scattering for the high energetic primary electrons as well as the cascade secondary electrons generated. The 20nm limit is imposed by the secondary emission scattering. In order to prove the concept, experiments were conducted using the safe and low-activity (1mCi∕cm2) beta particle emitting Ni63 thin film source with electrons emitted at an average energy of 14.9keV. They exposed negative tone resist NEB31A, and a minimum gap between ebeam resist posts or CD of 100nm was achieved. The secondary electrons generated by the primary electron impact onto mask are also useful for exposure. Compared to traditional electron beam lithography, with serial raster scanning taking days to expose a wafer, the lithography system will enable parallel exposure of large patterns on arbitrarily large wafers in several minutes. SPEL may enable massively parallel top-down approach to realizing nanostructures in bulk quantities.
High-Efficiency Ordered Silicon Nano-Conical-Frustum Array Solar Cells by Self-Powered Parallel Electron Lithography
Publisher: American Chemical Society (ACS)
Date: 12-10-2010
DOI: 10.1021/NL102867A
Abstract: Nanostructured silicon thin film solar cells are promising, due to the strongly enhanced light trapping, high carrier collection efficiency, and potential low cost. Ordered nanostructure arrays, with large-area controllable spacing, orientation, and size, are critical for reliable light-trapping and high-efficiency solar cells. Available top-down lithography approaches to fabricate large-area ordered nanostructure arrays are challenging due to the requirement of both high lithography resolution and high throughput. Here, a novel ordered silicon nano-conical-frustum array structure, exhibiting an impressive absorbance of 99% (upper bound) over wavelengths 400-1100 nm by a thickness of only 5 μm, is realized by our recently reported technique self-powered parallel electron lithography that has high-throughput and sub-35-nm high resolution. Moreover, high-efficiency (up to 10.8%) solar cells are demonstrated, using these ordered ultrathin silicon nano-conical-frustum arrays. These related fabrication techniques can also be transferred to low-cost substrate solar energy harvesting device applications.
Quasi-line Spectral Emissions from Highly Crystalline One-Dimensional Organic Nanowires
Publisher: American Chemical Society (ACS)
Date: 11-10-2019
DOI: 10.1021/ACS.NANOLETT.9B02943
Abstract: Zero-phonon line (ZPL) emissions have key applications in single-photon emission sources, quantum information processing, and single-molecule spectroscopy. All recent attempts to realize ZPL emissions are based on the techniques of confining and doping molecules in matrixes or solutions in low-temperature Shpol'skii systems. The requirement of two-component systems reduces the light emission efficiency from the molecules and limits their applications in solid-state electronic applications and quantum computing devices. Here, we report the first experimental demonstration of the Shpol'skii effect in a one-component organic solid-state system at low temperature. We observe a ZPL emission with a width of ∼1 to 2 nm and a high value of the Debye-Waller factor (0.72) from our epitaxially grown highly crystalline and ordered 1D organic nanowire, which is attributed to a specific molecular configuration and a higher degree of molecular orientation as compared to that of the bulk thin film counterpart. Our results pave the way for organic 1D wires (with quasi-line spectra) for applications in lasing, nanosensors, and interconnects/functional units in next-generation miniaturized optoelectronics.
Layer-dependent surface potential of phosphorene and anisotropic/layer-dependent charge transfer in phosphorene–gold hybrid systems
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5NR04366B
Abstract: The surface potential and the efficiency of interfacial charge transfer are extremely important for designing future semiconductor devices based on the emerging two-dimensional (2D) phosphorene.
Mechanisms and applications of steady-state photoluminescence spectroscopy in two-dimensional transition-metal dichalcogenides
Publisher: American Chemical Society (ACS)
Date: 06-11-2020
Ferroelectric-Driven Exciton and Trion Modulation in Monolayer Molybdenum and Tungsten Diselenides
Publisher: American Chemical Society (ACS)
Date: 24-04-2019
Abstract: In this work, we show how domain-engineered lithium niobate can be used to selectively dope monolayer molybdenum selenide (MoSe
Selective Etching of Metallic Carbon Nanotubes by Gas-Phase Reaction
Publisher: American Association for the Advancement of Science (AAAS)
Date: 10-11-2006
Abstract: Metallic and semiconducting carbon nanotubes generally coexist in as-grown materials. We present a gas-phase plasma hydrocarbonation reaction to selectively etch and gasify metallic nanotubes, retaining the semiconducting nanotubes in near-pristine form. With this process, 100% of purely semiconducting nanotubes were obtained and connected in parallel for high-current transistors. The diameter- and metallicity-dependent “dry” chemical etching approach is scalable and compatible with existing semiconductor processing for future integrated circuits.
High-Luminescence and Submillimeter-Scale MoS2 Monolayer Growth Using Combinational Phase Precursors via Chemical Vapor Deposition
Publisher: American Chemical Society (ACS)
Date: 03-10-2022
Giant Plasmene Nanosheets, Nanoribbons, and Origami
Publisher: American Chemical Society (ACS)
Date: 02-10-2014
DOI: 10.1021/NN504615A
Abstract: We introduce Plasmene- in analogy to graphene-as free-standing, one-particle-thick, superlattice sheets of nanoparticles ("meta-atoms") from the "plasmonic periodic table", which has implications in many important research disciplines. Here, we report on a general bottom-up self-assembly approach to fabricate giant plasmene nanosheets (i.e., plasmene with nanoscale thickness but with macroscopic lateral dimensions) as thin as ∼40 nm and as wide as ∼3 mm, corresponding to an aspect ratio of ∼75,000. In conjunction with top-down lithography, such robust giant nanosheets could be milled into one-dimensional nanoribbons and folded into three-dimensional origami. Both experimental and theoretical studies reveal that our giant plasmene nanosheets are analogues of graphene from the plasmonic nanoparticle family, simultaneously possessing unique structural features and plasmon propagation functionalities.
Low-concentration mechanical biosensor based on a photonic crystal nanowire array
Publisher: Springer Science and Business Media LLC
Date: 06-12-2011
DOI: 10.1038/NCOMMS1587
Abstract: The challenge for new biosensors is to achieve detection of biomolecules at low concentrations, which is useful for early-stage disease detection. Nanomechanical biosensors are promising in medical diagnostic applications. For nanomechanical biosensing at low concentrations, a sufficient resonator device surface area is necessary for molecules to bind to. Here we present a low-concentration (500 aM sensitivity) DNA sensor, which uses a novel nanomechanical resonator with ordered vertical nanowire arrays on top of a Si/SiO(2) bilayer thin membrane. The high sensitivity is achieved by the strongly enhanced total surface area-to-volume ratio of the resonator (10(8) m(-1)) and the state-of-the-art mass-per-area resolution (1.8×10(-12) kg m(-2)). Moreover, the nanowire array forms a photonic crystal that shows strong light trapping and absorption over broad-band optical wavelengths, enabling high-efficiency broad-band opto-thermo-mechanical remote device actuation and biosensing on a chip. This method represents a mass-based platform technology that can sense molecules at low concentrations.
High-efficiency Wavelength Tunable Monolayer LED with Hybrid Continuous-pulsed Injection
Publisher: Research Square Platform LLC
Date: 30-11-2020
DOI: 10.21203/RS.3.RS-110731/V1
Abstract: High-efficiency and wavelength-tunable light emitting diode (LED) devices will play an important role in future advanced optoelectronic systems. Traditional semiconductor LED devices typically have a fixed emission wavelength that is determined by the energy of the emission states. Here, we developed a novel high-efficiency and wavelength-tunable monolayer WS 2 LED device, which operates in the hybrid mode of continuous-pulsed injection. This hybrid injection enables highly enhanced emission efficiency ( 20 times) and the effective size of emission area ( 5 times) at room temperature. The emission wavelength of WS 2 monolayer LED device can be tuned over more than 40 nm by driving AC voltages, from exciton emission to trion emission, and further to defect emissions. The quantum efficiency of defect electroluminescence (EL) emission is measured to be more than 24.5 times larger than that from free exciton and trion EL emissions. The separate carrier injection in our LED also demonstrate advantage in allowing to visualize and distinguish defect species in real space. Those defects are assigned to be negatively charged defects. Our results open a new route to develop high-performance and wavelength-tunable LED devices for future advanced optoelectronic applications.
Electrical transport properties and field effect transistors of carbon nanotubes
Publisher: World Scientific Pub Co Pte Lt
Date: 07-2006
DOI: 10.1142/S1793292006000070
Abstract: This paper presents a review on our recent work on carbon nanotube field effect transistors, including the development of ohmic contacts, high-κ gate dielectric integration, chemical functionalization for conformal dielectric deposition and pushing the performance limit of nanotube FETs by channel length scaling. Due to the importance of high current operations of electronic devices, we also review the high field electrical transport properties of nanotubes on substrates and in freely suspended forms. Owing to their unique properties originating from their crystalline 1D structure and the strong covalent carbon–carbon bonding configuration, carbon nanotubes are highly promising as building blocks for future electronics. They are found to perform favorably in terms of ON-state current density as compared to the existing silicon technology, owing to their superb electron transport properties and compatibility with high-κ gate dielectrics. Future directions and challenges for carbon nanotube-based electronics are also discussed.
Towards future physics and applications via two-dimensional material NEMS resonators
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0NR06773C
Abstract: Two-dimensional materials (2Dm) offer a unique insight into the world of quantum mechanics including van der Waals (vdWs) interactions, exciton dynamics and various other nanoscale phenomena.
Facial first impressions and partner preference models: Comparable or distinct underlying structures?
Publisher: Wiley
Date: 17-12-2018
DOI: 10.1111/BJOP.12286
Extraordinary second harmonic generation modulated by divergent strain field in pressurized monolayer domes
Publisher: AIP Publishing
Date: 30-05-2023
DOI: 10.1063/5.0144641
Abstract: The most prominent form of nonlinear optical (NLO) frequency conversion is second harmonic generation (SHG), where incident light interacts with a nonlinear medium producing photons at double the input frequency, which has vast applications in material and biomedical science. Emerging two-dimensional nonlinear optical materials led by transition metal dichalcogenides (TMDs) have fascinating optical and mechanical properties and are highly anticipated to overcome the technical limitations imposed by traditional bulky NLO materials. However, the atomic scale interaction length and low conversion efficiency in TMD materials prevent their further implementation in NLO applications. While some uniaxial strain-engineering studies intensively investigated the anisotropic SHG response in TMDs, they did not realize giant SHG enhancement by exploiting the opto-mechanical characteristics. Herein, we employ proton (H+) irradiation to successfully fabricate large pressurized monolayer TMD domes (d ≥ 10 μm) and conduct a comprehensive investigation and characterization of their SHG performance enhancement. We show that the intensity of SHG is effectively enhanced by around two orders of magnitude at room temperature. Such giant enhancement arises from the distinct separation distance induced by capped pressurized gas and the hemi-spherical morphology, enabling constructive optical interference. Moreover, the unique ergent strain field in TMD domes promotes the first experimental study on the anisotropic nonlinear optical behavior based on biaxial strain conditions in terms of varying strain orientation and relative weights. Our work demonstrates a promising system with enhanced NLO performance and well-preserved biocompatibility, paving a way toward the future nano-scaled quantum optics design and biomedical applications.
Optical Harmonic Generation in 2D Materials
Publisher: Wiley
Date: 16-12-2021
Abstract: 2D materials are emerging as ideal candidates for fundamental investigations and new technologies due to their unique optoelectronic properties. Giant nonlinear susceptibility and perfect phase matching in 2D materials lead to extraordinary nonlinear light matter interactions, thus enabling several potential applications and fundamental scientific discoveries in nonlinear optics. For instance, second harmonic generation in 2D materials play an important role in optical devices such as, lasers, tunable waveguides, electro‐optic modulators, and switches. This review will discuss optical harmonic generation (OHG) processes, various characterization modes, and tuning techniques in 2D materials. The future prospectives for OHG in 2D materials is discussed. The extremely promising attributes of combining nonlinear optics and 2D materials is becoming a highly important multidisciplinary field.
Atomic localization of quantum emitters in multilayer hexagonal boron nitride
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR04269E
Abstract: The atomic plasma etching removes one hBN monolayer at a time. After some etching step, the quantum emitter disappears.
Hydrogenation and hydrocarbonation and etching of single-walled carbon nanotubes
Publisher: American Chemical Society (ACS)
Date: 19-04-2006
DOI: 10.1021/JA061324B
Abstract: We present a systematic experimental investigation of the reactions between hydrogen plasma and single-walled carbon nanotubes (SWNTs) at various temperatures. Microscopy, infrared (IR) and Raman spectroscopy, and electrical transport measurements are carried out to investigate the properties of SWNTs after hydrogenation. Structural deformations, drastically reduced electrical conductance, and an increased semiconducting nature of SWNTs upon sidewall hydrogenation are observed. These changes are reversible upon thermal annealing at 500 degrees C via dehydrogenation. Harsh plasma or high temperature reactions lead to etching of nanotubes likely via hydrocarbonation. Smaller SWNTs are markedly less stable against hydrocarbonation than larger tubes. The results are fundamental and may have implications to basic and practical applications including hydrogen storage, sensing, band gap engineering for novel electronics, and new methods of manipulation, functionalization, and etching of nanotubes.
Engineering the Dynamics and Transport of Excitons, Trions, and Biexcitons in Monolayer WS2
Publisher: American Chemical Society (ACS)
Date: 09-2022
Exciton and Trion Dynamics in Bilayer MoS2
Publisher: Wiley
Date: 06-11-2015
Abstract: The control of exciton and triondynamics in bilayer MoS2 is demonstrated, via the comodulations by both temperature and electric field. The calculations here show that the band structure of bilayer MoS2 changes from indirect at room temperature toward direct nature as temperature decreases, which enables the electrical tunability of the K-K direct PL transition in bilayer MoS2 at low temperature.
Facial First Impressions Across Culture: Data-Driven Modeling of Chinese and British Perceivers’ Unconstrained Facial Impressions
Publisher: SAGE Publications
Date: 10-12-2018
Abstract: People form first impressions from facial appearance rapidly, and these impressions can have considerable social and economic consequences. Three dimensions can explain Western perceivers’ impressions of Caucasian faces: approachability, youthful-attractiveness, and dominance. Impressions along these dimensions are theorized to be based on adaptive cues to threat detection or sexual selection, making it likely that they are universal. We tested whether the same dimensions of facial impressions emerge across culture by building data-driven models of first impressions of Asian and Caucasian faces derived from Chinese and British perceivers’ unconstrained judgments. We then cross-validated the dimensions with computer-generated average images. We found strong evidence for common approachability and youthful-attractiveness dimensions across perceiver and face race, with some evidence of a third dimension akin to capability. The models explained ~75% of the variance in facial impressions. In general, the findings demonstrate substantial cross-cultural agreement in facial impressions, especially on the most salient dimensions.
Emission Control from Transition Metal Dichalcogenide Monolayers by Aggregation-Induced Molecular Rotors
Publisher: American Chemical Society (ACS)
Date: 13-05-2020
Excited State Biexcitons in Atomically Thin MoSe2
Publisher: American Chemical Society (ACS)
Date: 10-07-2017
Abstract: The tightly bound biexcitons found in atomically thin semiconductors have very promising applications for optoelectronic and quantum devices. However, there is a discrepancy between theory and experiment regarding the fundamental structure of these biexcitons. Therefore, the exploration of a biexciton formation mechanism by further experiments is of great importance. Here, we successfully triggered the emission of biexcitons in atomically thin MoSe
Producing air-stable monolayers of phosphorene and their defect engineering
Publisher: Springer Science and Business Media LLC
Date: 22-01-2016
DOI: 10.1038/NCOMMS10450
Abstract: It has been a long-standing challenge to produce air-stable few- or monolayer s les of phosphorene because thin phosphorene films degrade rapidly in ambient conditions. Here we demonstrate a new highly controllable method for fabricating high quality, air-stable phosphorene films with a designated number of layers ranging from a few down to monolayer. Our approach involves the use of oxygen plasma dry etching to thin down thick-exfoliated phosphorene flakes, layer by layer with atomic precision. Moreover, in a stabilized phosphorene monolayer, we were able to precisely engineer defects for the first time, which led to efficient emission of photons at new frequencies in the near infrared at room temperature. In addition, we demonstrate the use of an electrostatic gate to tune the photon emission from the defects in a monolayer phosphorene. This could lead to new electronic and optoelectronic devices, such as electrically tunable, broadband near infrared lighting devices operating at room temperature.
Vanadium-Doped Monolayer MoS2 with Tunable Optical Properties for Field-Effect Transistors
Publisher: American Chemical Society (ACS)
Date: 31-12-2020
Recent Developments in van der Waals Antiferromagnetic 2D Materials: Synthesis, Characterization, and Device Implementation
Publisher: American Chemical Society (ACS)
Date: 15-11-2021
Abstract: Magnetism in two dimensions is one of the most intriguing and alluring phenomena in condensed matter physics. Atomically thin 2D materials have emerged as a promising platform for exploring magnetic properties, leading to the development of essential technologies such as supercomputing and data storage. Arising from spin and charge dynamics in elementary particles, magnetism has also unraveled promising advances in spintronic devices and spin-dependent optoelectronics and photonics. Recently, antiferromagnetism in 2D materials has received extensive attention, leading to significant advances in their understanding and emerging applications such materials have zero net magnetic moment yet are internally magnetic. Several theoretical and experimental approaches have been proposed to probe, characterize, and modulate the magnetic states efficiently in such systems. This Review presents the latest developments and current status for tuning the magnetic properties in distinct 2D van der Waals antiferromagnets. Various state-of-the-art optical techniques deployed to investigate magnetic textures and dynamics are discussed. Furthermore, device concepts based on antiferromagnetic spintronics are scrutinized. We conclude with remarks on related challenges and technological outlook in this rapidly expanding field.
Highly Efficient and Air-Stable Infrared Photodetector Based on 2D Layered Graphene–Black Phosphorus Heterostructure
Publisher: American Chemical Society (ACS)
Date: 05-10-2017
Abstract: The presence of a direct band gap and high carrier mobility in few-layer black phosphorus (BP) offers opportunities for using this material for infrared (IR) light detection. However, the poor air stability of BP and its large contact resistance with metals pose significant challenges to the fabrication of highly efficient IR photodetectors with long lifetimes. In this work, we demonstrate a graphene-BP heterostructure photodetector with ultrahigh responsivity and long-term stability at IR wavelengths. In our device architecture, the top layer of graphene functions not only as an encapsulation layer but also as a highly efficient transport layer. Under illumination, photoexcited electron-hole pairs generated in BP are separated and injected into graphene, significantly reducing the Schottky barrier between BP and the metal electrodes and leading to efficient photocurrent extraction. The graphene-BP heterostructure phototransistor exhibits a long-term photoresponse at near-infrared wavelength (1550 nm) with an ultrahigh photoresponsivity (up to 3.3 × 10
Electrically driven light emission from hot single-walled carbon nanotubes at various temperatures and ambient pressures
Publisher: AIP Publishing
Date: 24-12-2007
DOI: 10.1063/1.2827281
Abstract: Electroluminescence of in idual single-walled carbon nanotubes down to ∼15K is measured. We observe electrically driven light emission from suspended quasimetallic nanotubes in vacuum down to ∼15K and under different gas pressures at room temperature. Light emission is found to originate from hot electrons in the presence of electrically driven nonequilibrium optical phonons. Reduced light emission is observed in exponential manner as electron and optical phonon temperatures in the nanotube are lowered by lower ambient temperature or higher gas pressure. The results reveal over wide ambient conditions, light emission in a suspended tube is from thermally excited electron-hole recombination.
Facial first impressions from another angle: How social judgements are influenced by changeable and invariant facial properties
Publisher: Wiley
Date: 22-07-2017
DOI: 10.1111/BJOP.12206
Extraordinary Nonlinear Optical Interaction from Strained Nanostructures in van der Waals CuInP2S6
Publisher: American Chemical Society (ACS)
Date: 18-08-2022
Abstract: Local strain engineering and structural modification of 2D materials furnish benevolent control over their optoelectronic properties and provide an exciting approach to tune light-matter interaction in layered materials. Application of strain at the nanoscale is typically obtained through permanently deformed nanostructures such as nanowrinkles, which yield large band gap modulation, photoluminescence enhancement, and surface potential. Ultrathin transition metal dichalcogenides (TMDs) have been greatly analyzed for such purposes. Herein, we extend strain-induced nanoengineering to an emerging 2D material, CuInP
Giant built-in electric field enabled quantum-confined Stark effects
Publisher: Research Square Platform LLC
Date: 25-10-2023
Temporal and spatial localization of prediction-error signals in the visual brain
Publisher: Elsevier BV
Date: 04-2017
Tunable Optoelectronic Properties of WS 2 by Local Strain Engineering and Folding
Publisher: Wiley
Date: 28-02-2020
Aluminium and zinc co-doped CuInS2 QDs for enhanced trion modulation in monolayer WS2 toward improved electrical properties
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TC05469C
Abstract: Precisely tuned trion ratios in monolayer WS 2 with improved electrical properties are achieved by QD modification, exhibiting potential optoelectronic applications.
Blue-shifted and strongly-enhanced light emission in transition-metal dichalcogenide twisted heterobilayers
Publisher: Springer Science and Business Media LLC
Date: 24-05-2022
DOI: 10.1038/S41699-022-00308-6
Abstract: Moiré heterostructures produced by twisted heterojunction of transition-metal dichalcogenides are recognized as novel platforms for unique and tunable means of controlling the optical phenomena including photoluminescence (PL). Despite some interesting results on the PL peak shifts by the heterojunction at twist angles ( θ ) far from 0 or 60°, all of them are redshifts. Here, we first report blue shift of energy and strong enhancement of intensity in the PL by twisted heterojunction of MoS 2 and WS 2 monolayers (MLs) in a particular range of θ . The PL peak energy of the heterobilayer steeply increases (about 120 meV) as θ gets closer to 15 or 52° from 3 or 57°, respectively and reaches a plateau at around 2.01 eV in the θ range from 15 to 52°, higher than that of the separate MoS 2 or WS 2 ML. The PL intensity shows a similar θ -dependent behavior with its magnitude in the plateau being ∼4 or 80 times larger than that of the WS 2 or MoS 2 ML, respectively. These novel light-emission behaviors are well explained with reference to theoretical predictions on the avoided crossing between the intralayer and interlayer excitons. Our findings highlight extendable tuning and remarkable enhancement of light emission from two-dimensional semiconductors by a simple approach of twisted heterojunction in a proper θ range, very useful for their optoelectronic device applications.
Wearable and long-range MXene 5G antenna energy harvester
Publisher: AIP Publishing
Date: 09-2023
DOI: 10.1063/5.0146976
Applications of Nanowire Enabled Micro Opto-Thermal Actuation
Publisher: The Electrochemical Society
Date: 27-04-2012
DOI: 10.1149/1.3700944
Abstract: Optical actuation for MEMS takes advantage of directly coupling of energy into selected device areas without any electrical interconnects as required in integrated electrostatic and piezoelectric actuation. In opto-thermo-mechanical actuation, light incident onto the structures is absorbed and converted to heat via photon absorption. Here, we realized linear, high efficiency and broad-band optical actuation for circular Si/SiO2 membrane resonator with integrated vertical silicon nano-pillar photonic crystal arrays. The first-ever nanopillar membrane acoustic speaker, using nanoscale photonic crystal optical absorbers for thermo-mechanical excitation of speaker membrane, is demonstrated. Moreover, our device has a very high surface area-to-volume ratio, enabling DNA sensing of femtomolar concentration. Femtomolar concentration DNA detection is important as this is the concentration needed for early-stage cancer and bacterial infection diagnosis application. Our method represents a mass-based platform technology that can sense molecules at low concentrations.
π-phase modulated monolayer supercritical lens
Publisher: Springer Science and Business Media LLC
Date: 04-01-2021
DOI: 10.1038/S41467-020-20278-X
Abstract: The emerging monolayer transition metal dichalcogenides have provided an unprecedented material platform for miniaturized opto-electronic devices with integrated functionalities. Although excitonic light–matter interactions associated with their direct bandgaps have received tremendous research efforts, wavefront engineering is less appreciated due to the suppressed phase accumulation effects resulting from the vanishingly small thicknesses. By introducing loss-assisted singular phase behaviour near the critical coupling point, we demonstrate that integration of monolayer MoS 2 on a planar ZnO/Si substrate, approaching the physical thickness limit of the material, enables a π phase jump. Moreover, highly dispersive extinctions of MoS 2 further empowers broadband phase regulation and enables binary phase-modulated supercritical lenses manifesting constant sub-diffraction-limited focal spots of 0.7 Airy units (AU) from the blue to yellow wavelength range. Our demonstrations downscaling optical elements to atomic thicknesses open new routes for ultra-compact opto-electronic systems harnessing two-dimensional semiconductor platforms with integrated functionalities.
Fabrication of High-Performance CsPbBr3 Perovskite Quantum Dots/Polymer Composites via Photopolymerization: Implications for Luminescent Displays and Lighting
Publisher: American Chemical Society (ACS)
Date: 19-12-2022
Optical Properties of Ultrashort Semiconducting Single-Walled Carbon Nanotube Capsules Down to Sub-10 nm
Publisher: American Chemical Society (ACS)
Date: 22-04-2008
DOI: 10.1021/JA8006929
Abstract: Single-walled carbon nanotubes (SWNTs) are typically long (greater than or approximately equal 100 nm) and have been well established as novel quasi one-dimensional systems with interesting electrical, mechanical, and optical properties. Here, quasi zero-dimensional SWNTs with finite lengths down to the molecular scale (7.5 nm in average) were obtained by length separation using a density gradient ultracentrifugation method. Different sedimentation rates of nanotubes with different lengths in a density gradient were taken advantage of to sort SWNTs according to length. Optical experiments on the SWNT fractions revealed that the UV-vis-NIR absorption and photoluminescence peaks of the ultrashort SWNTs blue-shift up to approximately 30 meV compared to long nanotubes, owing to quantum confinement effects along the length of ultrashort SWNTs. These nanotube capsules essentially correspond to SWNT quantum dots.
Direct Measurement of Folding Angle and Strain Vector in Atomically Thin WS2 Using Second-Harmonic Generation
Publisher: American Chemical Society (ACS)
Date: 12-11-2020
Highly Enhanced Many-Body Interactions in Anisotropic 2D Semiconductors
Publisher: American Chemical Society (ACS)
Date: 19-04-2018
DOI: 10.1021/ACS.ACCOUNTS.7B00504
Abstract: Atomically thin two-dimensional (2D) semiconductors have presented a plethora of opportunities for future optoelectronic devices and photonics applications, made possible by the strong light matter interactions at the 2D quantum limit. Many body interactions between fundamental particles in 2D semiconductors are strongly enhanced compared with those in bulk semiconductors because of the reduced dimensionality and, thus, reduced dielectric screening. These enhanced many body interactions lead to the formation of robust quasi-particles, such as excitons, trions, and biexcitons, which are extremely important for the optoelectronics device applications of 2D semiconductors, such as light emitting diodes, lasers, and optical modulators, etc. Recently, the emerging anisotropic 2D semiconductors, such as black phosphorus (termed as phosphorene) and phosphorene-like 2D materials, such as ReSe
Tunable unidirectional nonlinear emission from transition-metal-dichalcogenide metasurfaces
Publisher: Springer Science and Business Media LLC
Date: 22-09-2021
DOI: 10.1038/S41467-021-25717-X
Abstract: Nonlinear light sources are central to a myriad of applications, driving a quest for their miniaturisation down to the nanoscale. In this quest, nonlinear metasurfaces hold a great promise, as they enhance nonlinear effects through their resonant photonic environment and high refractive index, such as in high-index dielectric metasurfaces. However, despite the sub-diffractive operation of dielectric metasurfaces at the fundamental wave, this condition is not fulfilled for the nonlinearly generated harmonic waves, thereby all nonlinear metasurfaces to date emit multiple diffractive beams. Here, we demonstrate the enhanced single-beam second- and third-harmonic generation in a metasurface of crystalline transition-metal-dichalcogenide material, offering the highest refractive index. We show that the interplay between the resonances of the metasurface allows for tuning of the unidirectional second-harmonic radiation in forward or backward direction, not possible in any bulk nonlinear crystal. Our results open new opportunities for metasurface-based nonlinear light-sources, including nonlinear mirrors and entangled-photon generation.
Vacuum-Free Self-Powered Parallel Electron Lithography with Sub-35-nm Resolution
Publisher: American Chemical Society (ACS)
Date: 19-05-2010
DOI: 10.1021/NL101055H
Abstract: The critical dimension, throughput, and cost of nanolithography are central to developing commercially viable high-performance nanodevices. Available top-down lithography approaches to fabricate large-area nanostructures at low cost, such as controllable nanowire (NW) array fabrication for solar cells applications, are challenging due to the requirement of both high lithography resolution and high throughput. Here, a minimum 35 nm resolution is experimentally demonstrated by using a new mask fabrication technique in our demonstrated vacuum-free high-throughput self-powered parallel electron lithography (SPEL) system, which uses large-area planar radioactive beta-electron thin film emitters to parallel expose e-beam resist through a stencil mask. SPEL is the first-time demonstrated vacuum-free electron lithography, which overcomes the membrane mask distortion challenge that was shown to be the Achilles heel of previous attempts at electron projection lithography in vacuum. Monte Carlo simulations show that by using beryllium tritide thin film source in SPEL system, the exposure time can be reduced down to 2 min for each large-area (10000 cm(2) or more) parallel exposure, with resolution not larger than 20 nm. Moreover, experimental demonstration of large-area diameter-and-density controllable vertical NW arrays fabricated by SPEL shows its promising utility for an application requiring large-area nanostructure definition.
DNA functionalization of carbon nanotubes for ultrathin atomic layer deposition of high kappa dielectrics for nanotube transistors with 60 mV/decade switching
Publisher: American Chemical Society (ACS)
Date: 03-2006
DOI: 10.1021/JA058836V
Abstract: For single-walled carbon nanotube (SWNT) field effect transistors, vertical scaling of high kappa dielectrics by atomic layer deposition (ALD) currently stands at approximately 8 nm with a subthreshold swing S approximately 70-90 mV/decade at room temperature. ALD on as-grown pristine SWNTs is incapable of producing a uniform and conformal dielectric layer due to the lack of functional groups on nanotubes and because nucleation of an oxide dielectric layer in the ALD process hinges upon covalent chemisorption on reactive groups on surfaces. Here, we show that by noncovalent functionalization of SWNTs with poly-T DNA molecules (dT40-DNA), one can impart functional groups of sufficient density and stability for uniform and conformal ALD of high kappa dielectrics on SWNTs with thickness down to 2-3 nm. This enables approaching the ultimate vertical scaling limit of nanotube FETs and reliably achieving S approximately 60 mV/decade at room temperature, and S approximately 50 mV/decade in the band-to-band tunneling regime of ambipolar transport. We have also carried out microscopy investigations to understand ALD processes on SWNTs with and without DNA functionalization.
Are We Face Experts?
Publisher: Elsevier BV
Date: 02-2018
Electronic applications of graphene mechanical resonators
Publisher: Institution of Engineering and Technology (IET)
Date: 11-2015
Extraordinary Photoluminescence and Strong Temperature/Angle-Dependent Raman Responses in Few-Layer Phosphorene
Publisher: American Chemical Society (ACS)
Date: 08-09-2014
DOI: 10.1021/NN503893J
Abstract: Phosphorene is a new family member of two-dimensional materials. We observed strong and highly layer-dependent photoluminescence in few-layer phosphorene (two to five layers). The results confirmed the theoretical prediction that few-layer phosphorene has a direct and layer-sensitive band gap. We also demonstrated that few-layer phosphorene is more sensitive to temperature modulation than graphene and MoS2 in Raman scattering. The anisotropic Raman response in few-layer phosphorene has enabled us to use an optical method to quickly determine the crystalline orientation without tunneling electron microscopy or scanning tunneling microscopy. Our results provide much needed experimental information about the band structures and exciton nature in few-layer phosphorene.
Facial Image Manipulation: A Tool for Investigating Social Perception
Publisher: SAGE Publications
Date: 19-06-2017
Graphene‐Enhanced Single Ion Detectors for Deterministic Near‐Surface Dopant Implantation in Diamond
Publisher: Wiley
Date: 08-09-2023
Quantitative kinetic analysis of PET amyloid imaging agents [11C]BF227 and [18F]FACT in human brain
Publisher: Elsevier BV
Date: 09-2015
DOI: 10.1016/J.NUCMEDBIO.2015.05.001
Abstract: The purpose of this study was to compare two amyloid imaging agents, [(11)C]BF227 and [(18)F]FACT (derivative from [(11)C]BF227) through quantitative pharmacokinetics analysis in human brain. Positron emission tomography studies were performed on six elderly healthy control (HC) subjects and seven probable Alzheimer's disease (AD) patients with [(11)C]BF227 and 10 HC subjects and 10 probable AD patients with [(18)F]FACT. Data from nine regions of interest were analyzed by several approaches, namely non-linear least-squared fitting methods with arterial input functions (one-tissue compartment model(1TCM), two-tissue compartment model (2TCM)), Logan plot, and linearized methods with reference region (Reference Logan plot (RefLogan), MRTM0, MRTM2). We also evaluated SUV and SUVR for both tracers. The parameters estimated by several approaches were compared between two tracers for detectability of differences between HC and AD patients. For [(11)C]BF227, there were no significant difference of VT (2TCM, 1TCM) and SUV in all regions (Student t-test p<0.05) and significant differences in the DVRs (Logan, RefLogan, and MRTM2) and SUVRs in six neocortical regions (p<0.05) between the HC and AD groups. For [(18)F]FACT, significant differences in DVRs (RefLogan, MRTM0, and MRTM2) were observed in more than four neocortical regions between the HC and AD groups (p<0.05), and the significant differences were found in SUVRs for two neocortical regions (inferior frontal coretex and lateral temporal coretex). Our results showed that both tracers can clearly distinguish between HC and AD groups although the pharmacokinetics and distribution patterns in brain for two tracers were substantially different. This study revealed that although the PET amyloid imaging agents [(11)C]BF227 and [(18)F]FACT have similar chemical and biological properties, they have different pharmacokinetics, and caution must be paid for usage of the tracers.
Modulated interlayer charge transfer dynamics in a monolayer TMD/metal junction
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NR08728H
Abstract: The interlayer interactions and coupling of mTMD–metal junction determine the performance of the corresponding optoelectronic devices.
Giant Photoluminescence Enhancement and Resonant Charge Transfer in Atomically Thin Two-Dimensional Cr2Ge2Te6/WS2 Heterostructures
Publisher: American Chemical Society (ACS)
Date: 04-02-2021
Optical tuning of exciton and trion emissions in monolayer phosphorene
Publisher: Springer Science and Business Media LLC
Date: 17-07-2015
DOI: 10.1038/LSA.2015.85
Multiwavelength Single Nanowire InGaAs/InP Quantum Well Light-Emitting Diodes
Publisher: American Chemical Society (ACS)
Date: 29-05-2019
DOI: 10.1021/ACS.NANOLETT.9B00959
Abstract: We report multiwavelength single InGaAs/InP quantum well nanowire light-emitting diodes grown by metal organic chemical vapor deposition using selective area epitaxy technique and reveal the complex origins of their electroluminescence properties. We observe that the single InGaAs/InP quantum well embedded in the nanowire consists of three components with different chemical compositions, axial quantum well, ring quantum well, and radial quantum well, leading to the electroluminescence emission with multiple wavelengths. The electroluminescence measurements show a strong dependence on current injection levels as well as temperatures and these are explained by interpreting the equivalent circuits in a minimized area of the device. It is also found that the electroluminescence properties are closely related to the distinctive triangular morphology with an inclined facet of the quantum well nanowire. Our study provides important new insights for further design, growth, and fabrication of high-performance quantum well-based nanowire light sources for a wide range of future optoelectronic and photonic applications.
Probing the chaotic boundary of a membrane resonator with nanowire arrays
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR05663J
Abstract: Mechanically induced nonlinearities in nano-electromechanical systems (NEMSs) are typically avoided in design due to their unpredictable nature however, by incorporating these normally unwanted nonlinear and chaotic phenomena, the performance of NEMS devices displays substantially different characteristics opening a broad new range of potential applications for their use.
Nano-engineering and nano-manufacturing in 2D materials: marvels of nanotechnology
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2NH00226D
Abstract: Nanoscale engineering in 2D layered materials have attracted profound interest and opened multifarious avenues for novel physics and real-life applications.
Natural variability is essential to learning new faces
Publisher: Informa UK Limited
Date: 02-11-2017
Quantum microscopy with van der Waals heterostructures
Publisher: Springer Science and Business Media LLC
Date: 07-11-2023
Understanding face familiarity
Publisher: Elsevier BV
Date: 03-2018
Robust Social Categorization Emerges From Learning the Identities of Very Few Faces
Publisher: American Psychological Association (APA)
Date: 03-2017
DOI: 10.1037/REV0000048
Compact Cavity-Enhanced Single-Photon Generation with Hexagonal Boron Nitride
Publisher: American Chemical Society (ACS)
Date: 26-06-2019
High-Efficiency Monolayer Molybdenum Ditelluride Light-Emitting Diode and Photodetector
Publisher: American Chemical Society (ACS)
Date: 11-2018
Abstract: Developing a high-efficiency and low-cost light source with emission wavelength transparent to silicon is an essential step toward silicon-based nanophotonic devices and micro/nano industry platforms. Here, a near-infrared monolayer MoTe
Extraordinary Phonon Displacement and Giant Resonance Raman Enhancement in WSe2/WS2 Moiré Heterostructures
Publisher: American Chemical Society (ACS)
Date: 28-11-2022
Abstract: Twisted van der Waals heterostructures are known to induce surprisingly erse and intriguing phenomena, such as correlated electronic phase and unconventional optical properties. This can be realized by controlled rotation of adjacent atomic planes, which provides an uncommon way to manipulate inelastic light-matter interactions. Here, we discover an extraordinary blue shift of 5-6 wavenumbers for high-frequency phonon modes in WS
Fabrication and Deterministic Transfer of High-Quality Quantum Emitters in Hexagonal Boron Nitride
Publisher: American Chemical Society (ACS)
Date: 06-04-2018
Robust Excitons and Trions in Monolayer MoTe2
Publisher: American Chemical Society (ACS)
Date: 11-06-2015
Abstract: Molybdenum telluride (MoTe2) has emerged as a special member in the family of two-dimensional transition metal dichalcogenide semiconductors, owing to the strong spin-orbit coupling and relatively small energy gap, which offers new applications in valleytronic and excitonic devices. Here we successfully demonstrated the electrical modulation of negatively charged (X(-)), neutral (X(0)), and positively charged (X(+)) excitons in monolayer MoTe2 via photoluminescence spectroscopy. The binding energies of X(+) and X(-) were measured to be ∼24 and ∼27 meV, respectively.The exciton binding energy of monolayer MoTe2 was measured to be 0.58 ± 0.08 eV via photoluminescence excitation spectroscopy, which matches well with our calculated value of 0.64 eV.
Enhanced Room Temperature Ferromagnetism in Highly Strained 2D Semiconductor Cr2Ge2Te6
Publisher: American Chemical Society (ACS)
Date: 22-12-2022
Evidence of the direct-to-indirect band gap transition in strained two-dimensional
WS 2
Publisher: American Physical Society (APS)
Date: 23-01-2020
Variant Plateau’s law in atomically thin transition metal dichalcogenide dome networks
Publisher: Springer Science and Business Media LLC
Date: 24-02-2023
DOI: 10.1038/S41467-023-36565-2
Abstract: Since its fundamental inception from soap bubbles, Plateau’s law has sparked extensive research in equilibrated states. However, most studies primarily relied on liquids, foams or cellular structures, whereas its applicability has yet to be explored in nano-scale solid films. Here, we observed a variant Plateau’s law in networks of atomically thin domes made of solid two-dimensional (2D) transition metal dichalcogenides (TMDs). Discrete layer-dependent van der Waals (vdWs) interaction energies were experimentally and theoretically obtained for domes protruding in different TMD layers. Significant surface tension differences from layer-dependent vdWs interaction energies manifest in a variant of this fundamental law. The equivalent surface tension ranges from 2.4 to 3.6 N/m, around two orders of magnitude greater than conventional liquid films, enabling domes to sustain high gas pressure and exist in a fundamentally variant nature for several years. Our findings pave the way towards exploring variant discretised states with applications in opto-electro-mechanical devices.
Elastic and Inelastic Light–Matter Interactions in 2D Materials
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2017
Lab free protein-based moisture electric generators with a high electric output
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3EE00770G
Abstract: Illustration of protein-based MEG generating electricity by absorbing water from moisture.
Varied Magnetic Phases in a van der Waals Easy-Plane Antiferromagnet Revealed by Nitrogen-Vacancy Center Microscopy
Publisher: American Chemical Society (ACS)
Date: 22-07-2022
Abstract: Interest in van der Waals materials often stems from a desire to miniaturize existing technologies by exploiting their intrinsic layered structures to create near-atomically thin components that do not suffer from surface defects. One appealing property is an easily switchable yet robust magnetic order, which is only sparsely demonstrated in the case of in-plane anisotropy. In this work, we use widefield nitrogen-vacancy (NV) center magnetic imaging to measure the properties of in idual flakes of CuCrP
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