ORCID Profile
0000-0002-5515-1127
Current Organisation
Guangdong Technion - Israel Institute of Technology
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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.
Quantum Optics | Condensed Matter Physics | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Condensed Matter Modelling and Density Functional Theory
Publisher: Elsevier BV
Date: 09-2023
Publisher: American Physical Society (APS)
Date: 26-09-2019
Publisher: The Optical Society
Date: 18-06-2013
DOI: 10.1364/OE.21.015183
Publisher: American Physical Society (APS)
Date: 26-10-2022
Publisher: IOP Publishing
Date: 02-2012
Publisher: SPIE-Intl Soc Optical Eng
Date: 18-07-2013
Publisher: American Physical Society (APS)
Date: 07-09-2023
Publisher: Springer Science and Business Media LLC
Date: 29-01-2016
DOI: 10.1038/SREP20091
Abstract: Light lification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.
Publisher: American Physical Society (APS)
Date: 15-01-2021
Publisher: IOP Publishing
Date: 02-2021
Abstract: We report on a novel mechanism of BCS-like superconductivity, mediated by a pair of Bogoliubov quasiparticles (bogolons). It takes place in hybrid systems consisting of a two-dimensional electron gas in a transition metal dichalcogenide monolayer in the vicinity of a Bose–Einstein condensate. Taking a system of two-dimensional indirect excitons as a testing ground of Bose-Einstein condensate we show, that the bogolon-pair-mediated electron pairing mechanism is stronger than phonon-mediated and single bogolon-mediated ones. We develop a microscopic theory of bogolon-pair-mediated superconductivity, based on the Schrieffer–Wolff transformation and the Gor’kov’s equations, study the temperature dependence of the superconducting gap and estimate the critical temperature of superconducting transition for various electron concentrations in the electron gas and the condensate densities.
Publisher: AIP Publishing
Date: 08-08-2016
DOI: 10.1063/1.4960797
Abstract: We present a microscopic theory for the description of the bias-controlled operation of an exciton-polariton-based heterostructure, in particular, the polariton laser. Combining together the Poisson equations for the scalar electric potential and Fermi quasi-energies of electrons and holes in a semiconductor heterostructure, the Boltzmann equation for the incoherent excitonic reservoir and the Gross-Pitaevskii equation for the exciton-polariton mean field, we simulate the dynamics of the system minimising the number of free parameters and build a theoretical threshold characteristic: number of particles vs applied bias. This approach, which also accounts for the nonlinear (exciton-exciton) interaction, particle lifetime, and which can, in principle, account for any relaxation mechanisms for the carriers of charge inside the heterostructure or polariton loss, allows to completely describe modern experiments on polariton transport and model devices.
Publisher: Wiley
Date: 30-03-2012
Publisher: MDPI AG
Date: 16-12-2022
DOI: 10.3390/SU142416921
Abstract: Supplier selection is an important task in supply chain management, as suppliers have a vital role in the success of organisations in a supply chain. Sustainability has emerged as a solution to decreasing resources and increasing environmental and social problems in the past few decades. It has been applied to various industrial operations, one of them is supplier selection, to mitigate unwanted effects in the future. Sustainable supplier selection is a complicated multi-criteria decision making problem, including several criteria from economic, environmental, and social perspectives. To deal with subjective judgements of decision makers, fuzzy and grey methods are widely used in multi-criteria decision making, In the case of small, limited, and incomplete data, the grey theory provides satisfactory results, compared to fuzzy methods. Therefore, this study is an integrated method including grey Best-Worst Method (BWM) and grey Weighted Sum-Product (WISP) for choosing the most sustainable supplier for a textile manufacturer, which includes three main criteria and twelve sub-criteria. According to the result of the proposed model, the supplier with the best performance was determined to be the supplier with the SP2 coded. The results of the developed model were shown to the experts, and the accuracy of the results was confirmed. According to the experts, a higher amount of product can be purchased from the supplier with the SP2 code, and a tighter relationship can be worked with this supplier. The contributions of this study are: (1) Develop a new grey MCDM model called Grey WISP. (2) Create a new integrated MCDM model with grey theory, BWM, and WISP methods that can be applied to assess supplier sustainability using this hybrid model. The proposed model can be used not just for selecting sustainable suppliers, but also for any other decision problems that have multiple criteria and alternatives. The findings suggest that the Grey WISP method achieved accurate results.
Publisher: American Physical Society (APS)
Date: 06-07-2020
Publisher: Cold Spring Harbor Laboratory
Date: 05-10-2020
DOI: 10.1101/2020.10.05.326504
Abstract: Nucleotide sequence and taxonomy reference databases are critical resources for widespread applications including marker-gene and metagenome sequencing for microbiome analysis, diet metabarcoding, and environmental DNA (eDNA) surveys. Reproducibly generating, managing, using, and evaluating nucleotide sequence and taxonomy reference databases creates a significant bottleneck for researchers aiming to generate custom sequence databases. Furthermore, database composition drastically influences results, and lack of standardizations limits cross-study comparisons. To address these challenges, we developed RESCRIPt, a software package for reproducible generation and management of reference sequence taxonomy databases, including dedicated functions that streamline creating databases from popular sources, and functions for evaluating, comparing, and interactively exploring qualitative and quantitative characteristics across reference databases. To highlight the breadth and capabilities of RESCRIPt, we provide several ex les for working with popular databases for microbiome profiling (SILVA, Greengenes, NCBI-RefSeq, GTDB), eDNA, and diet metabarcoding surveys (BOLD, GenBank), as well as for genome comparison. We show that bigger is not always better, and reference databases with standardized taxonomies and those that focus on type strains have quantitative advantages, though may not be appropriate for all use cases. Most databases appear to benefit from some curation (quality filtering), though sequence clustering appears detrimental to database quality. Finally, we demonstrate the breadth and extensibility of RESCRIPt for reproducible workflows with a comparison of global hepatitis genomes. RESCRIPt provides tools to democratize the process of reference database acquisition and management, enabling researchers to reproducibly and transparently create reference materials for erse research applications. RESCRIPt is released under a permissive BSD-3 license at okulich-lab/RESCRIPt .
Publisher: IEEE
Date: 09-2014
Publisher: American Physical Society (APS)
Date: 27-04-2020
Publisher: American Physical Society (APS)
Date: 27-08-2019
Publisher: IOP Publishing
Date: 28-06-2021
Publisher: American Physical Society (APS)
Date: 30-07-2018
Publisher: IEEE
Date: 06-2016
Publisher: American Physical Society (APS)
Date: 25-11-2013
Publisher: Springer Science and Business Media LLC
Date: 03-04-2017
DOI: 10.1038/SREP45243
Abstract: We consider exciton-photon coupling in semiconductor microcavities in which separate periodic potentials have been embedded for excitons and photons. We show theoretically that this system supports degenerate ground-states appearing at non-zero inplane momenta, corresponding to multiple valleys in reciprocal space, which are further separated in polarization corresponding to a polarization-valley coupling in the system. Aside forming a basis for valleytronics, the multivalley dispersion is predicted to allow for spontaneous momentum symmetry breaking and two-mode squeezing under non-resonant and resonant excitation, respectively.
Publisher: IOP Publishing
Date: 07-08-2018
Publisher: American Physical Society (APS)
Date: 11-12-2019
Publisher: SPIE
Date: 18-12-2013
DOI: 10.1117/12.2038484
Publisher: American Physical Society (APS)
Date: 07-11-2011
Publisher: American Physical Society (APS)
Date: 10-03-2016
Publisher: BMJ
Date: 16-06-2021
DOI: 10.1136/BMJSTEL-2021-000860
Abstract: Umbilical cord prolapse is a rare obstetric emergency requiring rapid coordination of a multidisciplinary team to effect urgent delivery. The decision to delivery interval (DDI) is a marker of quality of teamwork. Multidisciplinary team simulation-based training can be used to improve clinical and teamwork performance. To assess the DDI for cord prolapse before and after the introduction of simulation-based training at a quaternary maternity unit in Australia. A retrospective, observational cohort study comparing the DDI before and after the introduction of simulation-based training activities. The general linear model was used to estimate the association between DDI and simulation training while adjusting for potential confounders including model of care (public or private) and time of birth (regular or after hours). After the introduction of simulation training, mean DDI decreased by 4.1 min (difference −4.1, 95% CI −6.2 to −1.9), after adjustment for confounding factors. Despite this, there was no difference in selected neonatal outcomes including Apgar score at 5 min and arterial cord pH. The introduction of simulation-based training was associated with a decrease in the DDI in the setting of cord prolapse.
Publisher: American Physical Society (APS)
Date: 08-04-2019
Publisher: American Physical Society (APS)
Date: 14-11-2014
Publisher: American Physical Society (APS)
Date: 27-12-2016
Publisher: American Physical Society (APS)
Date: 06-2021
Publisher: American Physical Society (APS)
Date: 06-07-2011
Publisher: Springer Science and Business Media LLC
Date: 18-05-2017
DOI: 10.1038/S41598-017-01125-4
Abstract: We study the pseudo-spin density response of a disordered two-dimensional spin-polarized Bose gas to weak alternating magnetic field, assuming that one of the spin states of the doublet is macroscopically occupied and Bose-condensed while the occupation of the other state remains much smaller. We calculate spatial and temporal dispersions of spin susceptibility of the gas taking into account spin-flip processes due to the transverse-longitudinal splitting, considering microcavity exciton polaritons as a testbed. Further, we use the Bogoliubov theory of weakly-interacting gases and show that the time-dependent magnetic field power absorption exhibits double resonance structure corresponding to two particle spin states (contrast to paramagnetic resonance in regular spin-polarized electron gas). We analyze the widths of these resonances caused by scattering on the disorder and show that, in contrast with the ballistic regime, in the presence of impurities, the polariton scattering on them is twofold: scattering on the impurity potential directly and scattering on the spatially fluctuating condensate density caused by the disorder. As a result, the width of the resonance associated with the Bose-condensed spin state can be surprisingly narrow in comparison with the width of the resonance associated with the non-condensed state.
Publisher: IOP Publishing
Date: 17-02-2016
DOI: 10.1088/0953-8984/28/10/105301
Abstract: Using the Feynman-Dyson diagram technique, we study nonlinear polariton-polariton scattering in a two-dimensional micropillar-based optical superlattice with hexagonal symmetry. We demonstrate that both the emerging polariton chirality and the loop Feynman diagrams up to infinite order should be strictly accounted for in the evaluation of the self-energy of the system. Further, we explicitly show that in such a design the time of polariton scattering towards the Dirac points can be drastically decreased which can be used, for instance, in engineering novel classes of polariton lasers with substantially reduced thresholds.
Publisher: American Physical Society (APS)
Date: 26-02-2020
Publisher: IOP Publishing
Date: 09-2021
Abstract: We develop a theory of the magnetoplasmon resonance (MPR) in two-dimensional superconductors in the fluctuating regime, where the temperature is slightly above the critical temperature of the superconducting transition. In this regime, unpaired electrons and fluctuating Cooper pairs coexist in the system and interact with each other via long-range Coulomb forces, forming a Bose–Fermi mixture. The s le is considered to be under the influence of an external time-dependent electromagnetic field with a frequency in sub-terahertz range and a permanent magnetic field. It is shown that the MPR of the system is strongly modified in the presence of superconducting fluctuations in the vicinity of the superconducting transition. In particular, the fluctuating Cooper pairs dramatically change the broadening of the MPR, which is reflected in the optical response of the system.
Publisher: Optica Publishing Group
Date: 13-03-2020
DOI: 10.1364/OL.386848
Abstract: We report on a peculiar propagation of bosons loaded by a short Laguerre–Gaussian pulse in a nearly flat band of a lattice potential. Taking a system of exciton polaritons in a kagome lattice as an ex le, we show that an initially localized condensate propagates in a specific direction in space, if anisotropy is taken into account. This propagation consists of quantum jumps, collapses, and revivals of the whole compact states, and it persists given any direction of anisotropy. This property reveals its signatures in the tight-binding model, and, surprisingly, it is much more pronounced in a continuous model. Quantum revivals are robust to the repulsive interaction and finite lifetime of the particles. Since no magnetic field or spin–orbit interaction is required, this system provides a new kind of easily implementable optical logic.
Publisher: American Physical Society (APS)
Date: 08-09-2015
Publisher: American Physical Society (APS)
Date: 22-04-2011
Publisher: American Physical Society (APS)
Date: 29-01-2021
Publisher: IEEE
Date: 09-2013
Publisher: American Physical Society (APS)
Date: 05-01-2018
Publisher: American Physical Society (APS)
Date: 15-05-2012
Publisher: American Physical Society (APS)
Date: 10-07-2012
Publisher: AIP Publishing
Date: 11-03-2013
DOI: 10.1063/1.4794847
Abstract: We propose a concept of surface plasmon-polariton lification in the structure comprising interface between dielectric, metal, and asymmetric quantum well. Due to the Rashba spin-orbit interaction, minima of dispersion relation for electrons in conduction band are shifted with respect to the maximum of dispersion dependence for holes in Γ-point. When energy and momentum intervals between extrema in dispersion relations of electrons and holes match dispersion relation of plasmons, indirect radiative transition can lify the plasmons excitation of leaky modes is forbidden due to the selection rules. Efficiency of the indirect radiative transition is calculated and design of the structure is analysed.
Publisher: American Physical Society (APS)
Date: 07-08-2018
Publisher: American Physical Society (APS)
Date: 18-09-2017
Publisher: American Physical Society (APS)
Date: 09-04-2021
Publisher: American Physical Society (APS)
Date: 12-08-2019
Publisher: Pleiades Publishing Ltd
Date: 06-2018
Publisher: American Physical Society (APS)
Date: 26-06-2019
Publisher: AIP Publishing
Date: 11-11-2013
DOI: 10.1063/1.4830007
Abstract: We propose an all-optical nonlinear router based on a double barrier gate connected to periodically modulated guides. A semiconductor microcavity is driven nonresonantly in-between the barriers to form an exciton-polariton condensate on a discrete state that is subject to the exciton blueshift. The subsequent coherent optical signal is allowed to propagate through a guide provided that the condensate energy is resonant with a miniband or is blocked if it faces a gap. While a symmetric s le operates as an optical switch, its asymmetric counterpart embodies a router turned to be polarization selective under applied magnetic field.
Publisher: American Physical Society (APS)
Date: 05-10-2015
Publisher: American Physical Society (APS)
Date: 18-05-2020
Publisher: American Physical Society (APS)
Date: 05-02-2019
Publisher: IOP Publishing
Date: 20-07-2023
Abstract: In a two-dimensional noncentrosymmetric transition metal dichalcogenide Ising superconductor in the fluctuating regime under the action of a uniform external electromagnetic field, a second-harmonic generation (SHG) effect takes place. There emerge two contributions to this effect, one conventional, which is due to the electron gas in its normal state, and the other one is of the Aslamazov–Larkin nature. Namely, it originates from the presence of fluctuating Cooper pairs in the system when the temperature approaches the temperature of the superconducting transition in the s le from above. Employing a usual approach to Ising superconductors, we lift the valley degeneracy by application of a weak out-of-plane external magnetic field, which produces a Zeeman effect. In calculations, we use the Boltzmann equations approach for the electron gas in the normal state, and the time-dependent Ginzburg–Landau equations for the fluctuating Cooper pairs, and show the emergence of SHG electric current characterized by a temperature-dependent broadening and a redshift.
Publisher: American Physical Society (APS)
Date: 13-04-2018
Publisher: American Physical Society (APS)
Date: 18-10-2018
Publisher: Pleiades Publishing Ltd
Date: 2013
Publisher: American Physical Society (APS)
Date: 03-10-2018
Publisher: American Physical Society (APS)
Date: 07-10-2022
Publisher: IEEE
Date: 10-2015
Publisher: IOP Publishing
Date: 02-2018
Publisher: American Physical Society (APS)
Date: 19-11-2018
Publisher: Springer Science and Business Media LLC
Date: 05-2013
DOI: 10.1038/NATURE12036
Abstract: Conventional semiconductor laser emission relies on stimulated emission of photons, which sets stringent requirements on the minimum amount of energy necessary for its operation. In comparison, exciton-polaritons in strongly coupled quantum well microcavities can undergo stimulated scattering that promises more energy-efficient generation of coherent light by 'polariton lasers'. Polariton laser operation has been demonstrated in optically pumped semiconductor microcavities at temperatures up to room temperature, and such lasers can outperform their weak-coupling counterparts in that they have a lower threshold density. Even though polariton diodes have been realized, electrically pumped polariton laser operation, which is essential for practical applications, has not been achieved until now. Here we present an electrically pumped polariton laser based on a microcavity containing multiple quantum wells. To prove polariton laser emission unambiguously, we apply a magnetic field and probe the hybrid light-matter nature of the polaritons. Our results represent an important step towards the practical implementation of polaritonic light sources and electrically injected condensates, and can be extended to room-temperature operation using wide-bandgap materials.
Publisher: American Physical Society (APS)
Date: 19-02-2015
Publisher: American Physical Society (APS)
Date: 18-03-2013
Publisher: American Physical Society (APS)
Date: 08-03-2019
Publisher: American Physical Society (APS)
Date: 19-08-2021
Publisher: American Physical Society (APS)
Date: 10-08-2015
Start Date: 02-2016
End Date: 07-2017
Amount: $373,536.00
Funder: Australian Research Council
View Funded Activity