ORCID Profile
0000-0002-7258-2607
Current Organisation
CSIRO
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer Science and Business Media LLC
Date: 30-08-2017
DOI: 10.1038/S41467-017-00427-5
Abstract: The discovery of monolayer superconductors bears consequences for both fundamental physics and device applications. Currently, the growth of superconducting monolayers can only occur under ultrahigh vacuum and on specific lattice-matched or dangling bond-free substrates, to minimize environment- and substrate-induced disorders/defects. Such severe growth requirements limit the exploration of novel two-dimensional superconductivity and related nanodevices. Here we demonstrate the experimental realization of superconductivity in a chemical vapour deposition grown monolayer material—NbSe 2 . Atomic-resolution scanning transmission electron microscope imaging reveals the atomic structure of the intrinsic point defects and grain boundaries in monolayer NbSe 2 , and confirms the low defect concentration in our high-quality film, which is the key to two-dimensional superconductivity. By using monolayer chemical vapour deposited graphene as a protective capping layer, thickness-dependent superconducting properties are observed in as-grown NbSe 2 with a transition temperature increasing from 1.0 K in monolayer to 4.56 K in 10-layer.
Publisher: Springer Science and Business Media LLC
Date: 17-11-2015
Publisher: Wiley
Date: 20-09-2016
Publisher: Springer Science and Business Media LLC
Date: 04-2018
DOI: 10.1038/S41586-018-0008-3
Abstract: Investigations of two-dimensional transition-metal chalcogenides (TMCs) have recently revealed interesting physical phenomena, including the quantum spin Hall effect
Publisher: Wiley
Date: 03-05-2021
Abstract: Lead halide perovskites are intriguing semiconductors for lasers due to high quantum yield, tunable bandgaps, and facile solution‐process ability. However, limited by the weak optical confinement, continuous‐wave (CW) pumped lasing, as one prerequisite for the electrically pumped lasing, is still challenging in bare lead halide perovskites without high‐quality factor ( Q ) artificial optical cavity. Herein, the lasing emission in methylammonium lead tribromide (MAPbBr 3 ) incorporated with a vertical microcavity under continuous pumping at 80 K is reported. The single‐crystalline MAPbBr 3 perovskite nanoplates are fabricated by the two‐step solution method. The MAPbBr 3 ‐based vertical cavity surface‐emitting laser (VCSEL) presents a low threshold of 55.2 W cm −2 and a high Q ‐factor of 1140 at low temperature. The low threshold lasing emission can be attributed to strong optical confinement in the high‐ Q cavity and great photoluminescence enhancement at 80 K, which is induced by a transition from tetragonal to orthorhombic phase, demonstrated by in situ temperature Raman spectroscopy. These findings envisage the prospective applications of single‐crystalline metal halide perovskites in practicable laser devices.
Publisher: Springer Science and Business Media LLC
Date: 21-01-2021
Publisher: Springer Science and Business Media LLC
Date: 20-03-2018
Publisher: Wiley
Date: 27-12-2018
Abstract: 2D Td-WTe
Publisher: Springer Science and Business Media LLC
Date: 17-09-2019
DOI: 10.1038/S41467-019-12128-2
Abstract: Van der Waals heterostructures of transition metal dichalcogenides with interlayer coupling offer an exotic platform to realize fascinating phenomena. Due to the type II band alignment of these heterostructures, electrons and holes are separated into different layers. The localized electrons induced doping in one layer, in principle, would lift the Fermi level to cross the spin-polarized upper conduction band and lead to strong manipulation of valley magnetic response. Here, we report the significantly enhanced valley Zeeman splitting and magnetic tuning of polarization for the direct optical transition of MoS 2 in MoS 2 /WS 2 heterostructures. Such strong enhancement of valley magnetic response in MoS 2 stems from the change of the spin-valley degeneracy from 2 to 4 and strong many-body Coulomb interactions induced by ultrafast charge transfer. Moreover, the magnetic splitting can be tuned monotonically by laser power, providing an effective all-optical route towards engineering and manipulating of valleytronic devices and quantum-computation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NH00306H
Abstract: Phonon depletion in the indirect recombination process of bilayer WS 2 has been proposed to unveil exceptionally robust valley polarization.
Publisher: Wiley
Date: 21-02-2019
Abstract: The emerging field of valleytronics has boosted intensive interests in investigating and controlling valley polarized light emission of monolayer transition metal dichalcogenides (1L TMDs). However, so far, the effective control of valley polarization degree in monolayer TMDs semiconductors is mostly achieved at liquid helium cryogenic temperature (4.2 K), with the requirements of high magnetic field and on-resonance laser, which are of high cost and unwelcome for applications. To overcome this obstacle, it is depicted that by electrostatic and optical doping, even at temperatures far above liquid helium cryogenic temperature (80 K) and under off-resonance laser excitation, a competitive valley polarization degree of monolayer WS
Publisher: Wiley
Date: 03-04-2017
Abstract: Due to the intriguing optical and electronic properties, 2D materials have attracted a lot of interest for the electronic and optoelectronic applications. Identifying new promising 2D materials will be rewarding toward the development of next generation 2D electronics. Here, palladium diselenide (PdSe
Publisher: AIP Publishing
Date: 07-2021
DOI: 10.1063/5.0052458
Abstract: Two-dimensional (2D) layered lead halide perovskites with large exciton binding energies, efficient radiative recombination, and outstanding environmental stability are regarded as supreme candidates for realizing highly compact and ultralow threshold lasers. However, continuous-wave (CW) pumped lasing of 2D lead halide perovskites, as the precondition for the electrically pumped lasing, is still challenging. Here, we tackled this challenge by demonstrating lasing emission in phenylethylammonium lead iodide [(PEA)2PbI4] embedded in a vertical microcavity under continuous pumping at room temperature. The millimeter-sized (PEA)2PbI4 single crystal was obtained from a two-step seed-growth method, showing high crystallization, excellent thermal stability, and outstanding optical properties. We used the exfoliated (PEA)2PbI4 thin flake as the gain medium to construct a vertical-cavity surface-emitting laser (VCSEL), showing robust single-mode CW lasing operation with an ultra-low threshold of 5.7 W cm−2 at room temperature, attributed to strong optical confinement in the high-Q cavity. Our findings provide a strategy to design and fabricate solution-based 2D perovskite VCSELs and mark a significant step toward the next-generation of coherent light sources.
Publisher: Wiley
Date: 09-2017
Publisher: Elsevier
Date: 2020
Publisher: American Chemical Society (ACS)
Date: 12-02-2020
Publisher: Elsevier BV
Date: 12-2011
Publisher: IOP Publishing
Date: 08-07-2019
Publisher: Elsevier BV
Date: 08-2012
Publisher: Springer Science and Business Media LLC
Date: 02-02-2018
Publisher: Wiley
Date: 02-07-2018
Abstract: Herein, a surfactant- and additive-free strategy is developed for morphology-controllable synthesis of cobalt pyrophosphate (CoPPi) nanostructures by tuning the concentration and ratio of the precursor solutions of Na
Publisher: Wiley
Date: 27-11-2019
DOI: 10.1002/INF2.12050
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 10-2013
Publisher: American Chemical Society (ACS)
Date: 26-10-2016
Publisher: Wiley
Date: 07-2020
Abstract: Bulk 1T‐TaSe 2 as a charge‐density‐wave (CDW) conductor is of special interest for CDW‐based nanodevice applications because of its high CDW transition temperature. Reduced dimensionality of the strongly correlated material is expected to result in significantly different collective properties. However, the growth of atomically thin 1T‐TaSe 2 crystals remains elusive, thus h ering studies of dimensionality effects on the CDW of the material. Herein, chemical vapor deposition (CVD) of atomically thin TaSe 2 crystals is reported with controlled 1T phase. Scanning transmission electron microscopy suggests the high crystallinity and the formation of CDW superlattice in the ultrathin 1T‐TaSe 2 crystals. The commensurate–incommensurate CDW transition temperature of the grown 1T‐TaSe 2 increases with decreasing film thickness and reaches a value of 570 K in a 3 nm thick layer, which is 97 K higher than that of previously reported bulk 1T‐TaSe 2 . This work enables the exploration of collective phenomena of 1T‐TaSe 2 in the 2D limit, as well as offers the possibility of utilizing the high‐temperature CDW films in ultrathin phase‐change devices.
Publisher: Wiley
Date: 10-01-2018
Abstract: Layered transition metal (Ti, Ta, Nb, etc.) dichalcogenides are important prototypes for the study of the collective charge density wave (CDW). Reducing the system dimensionality is expected to lead to novel properties, as exemplified by the discovery of enhanced CDW order in ultrathin TiSe
Publisher: American Chemical Society (ACS)
Date: 05-12-2016
Abstract: A general and mild strategy for fabricating defect-enriched graphene mesh (GM) and its application toward the anode of Li-ion batteries (LIBs) has been reported. The GM with a pore size of 60-200 nm is achieved by employing Fe
Publisher: Springer Science and Business Media LLC
Date: 08-2015
Publisher: Wiley
Date: 10-2020
Publisher: American Chemical Society (ACS)
Date: 21-04-2021
Publisher: IOP Publishing
Date: 20-03-2018
Publisher: American Chemical Society (ACS)
Date: 24-09-2019
Abstract: PtSe
Publisher: Springer Science and Business Media LLC
Date: 27-07-2018
Publisher: American Chemical Society (ACS)
Date: 15-02-2016
DOI: 10.1021/ACS.NANOLETT.5B04066
Abstract: Owing to direct band gap and strong spin-orbit coupling, monolayer transition-metal dichalcogenides (TMDs) exhibit rich new physics and great applicable potentials. The remarkable valley contrast and light emission promise such two-dimensional (2D) semiconductors a bright future of valleytronics and light-emitting diodes (LEDs). Though the electroluminescence (EL) has been observed in mechanically exfoliated small flakes of TMDs, considering real applications, a strategy that could offer mass-product and high compatibility is greatly demanded. Large-area and high-quality s les prepared by chemical vapor deposition (CVD) are perfect candidates toward such goal. Here, we report the first demonstration of electrically tunable chiral EL from CVD-grown monolayer WS2 by constructing a p-i-n heterojunction. The chirality contrast of the overall EL reaches as high as 81% and can be effectively modulated by forward current. The success of fabricating valley LEDs based on CVD WS2 opens up many opportunities for developing large-scale production of unconventional 2D optoelectronic devices.
Publisher: American Chemical Society (ACS)
Date: 09-10-2018
Abstract: External stimuli-controlled phase transitions are essential for fundamental physics and design of functional devices. Charge density wave (CDW) is a metastable collective electronic phase featured by the periodic lattice distortion. Much attention has been attracted to study the external control of CDW phases. Although much work has been done in the electric-field-induced CDW transition, the study of the role of Joule heating in the phase transition is insufficient. Here, using the Raman spectroscopy, the electric-field-driven phase transition is in situ observed in the ultrathin 1T-TaS
Publisher: Wiley
Date: 06-02-2020
No related grants have been discovered for Yu Chen.