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Controllable vortex lasing arrays in a geometrically frustrated exciton-polariton lattice at room temperature

National Science Review 2023年第1期10卷 196-204页

作者： Jun Wang Yutian Peng Huawen Xu Jiangang Feng Yuqing Huang Jinqi Wu Timothy C.H.Liew qihua xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Department of Optical Science and Engineering and Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Fudan University State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing Academy of Quantum Information Sciences

Quantized vortices appearing in topological excitations of quantum phase transition play a pivotal role in strongly correlated physics involving the underlying confluence of superfluids,Bose-Einstein condensates and superconductors.Exciton polaritons as bosonic quasiparticles have enabled studies of non-e quilibrium quantum gases and superfluidity.Exciton-polariton condensates in artificial lattices intuitively emulate energy-band structures and quantum many-body effects of condensed matter,underpinning constructing vortex lattices and controlling quantum fluidic circuits.Here,we harness exciton-polariton quantum fluids of light in a frustrated kagome lattice based on robust metal-halide perovskite microcavities,to demonstrate vortex lasing arrays and modulate their configurations at room temperature.Tomographic energy-momentum spectra unambiguously reveal massless Dirac bands and quenched kinetic-energy flat bands coexisting in kagome lattices,where polariton condensates exhibit prototypical honeycomb and kagome spatial patterns.Spatial coherence investigations illustrate two types of phase textures of polariton condensates carrying ordered quantized-vortex arrays and π-phase shifts,which could be selected when needed using lasing emission energy.Our findings offer a promising platform on which it is possible to study quantum-fluid correlations in complex polaritonic lattices and highlight feasible applications of structured light.

关键词： vortex lasing exciton–polariton lattice Bose–Einstein condensation the orbital angular momentum of light geometric frustration perovskite semiconductor

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Bose-Einstein condensation of exciton polariton in perovskites semiconductors

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Frontiers of Optoelectronics 2020年第3期13卷 193-195页

作者： Xinglin WEN qihua xiong School of Optical and Electronic Information and Wuhan National Laboratory for Optoclectronics Huazhong University of Science and TechnologyWuhan 430074China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Polariton-hybridization of light-matter oscillations can emerge from various quasiparticles,such as phonon,plasmon,exciton and magnon.Particularly,exciton polaritons are bosonic quasiparticles with half-light,half-matter nature,which are originated from strong coupling between excitons and microcavity photons.The half-light nature results in extremely small effective mass,making it feasible to achieve high temperature even room-tempera-ture Bose-Einstein condensation(BEC).Meanwhile,the half-matter nature leads to strong nonlinear interaction,which is missing between photons and can promote the polaritons relaxation to ground state and give rise to low threshold polariton lasing,compared to photonic lasing.The exciton polaritons are of great importance in applications of quantum simulation,topological quantum optics,ultrafast optical switch and low threshold lasers.

关键词： polar condensation Einstein

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Two-dimensional materials: new opportunities for electronics,photonics and optoelectronics

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Science Bulletin 2019年第15期64卷 1031-1032页

作者： qihua xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University

The exciting progress in graphene research in the past 15 years[1,2] has further stimulated the exploration of other non-graphene two-dimensional (2D) materials [3], such as h-BN [4,5], transitional metal dichalcogenides (TMDs)[6,7], black phosphorene [8],etc. Research on these ultimately atomic thin 2D materials has grown exponentially owning to their fascinating properties and enormous potential in the fields of physics, chemistry, optics and photonics, material sciences, medicine and engineering.

关键词： Two-dimensional materials new opportunities photonics

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The Nano Research Young Innovators(NR45)Awards in twodimensional materials

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Nano Research 2021年第6期14卷 1575-1582页

作者： Xiangfeng Duan qihua xiong Department of Chemistry University of CaliforniaLos AngelesLos AngelesCA90095USA State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Beijing Academy of Quantum Information Sciences Beijing100193China

Nano Research launched the Nano Research Young Innovator Awards(NR45)program in 2018 to feature young researchers under the age of 45 in various fields of nanoscience and nano-technology,in recognition of their distinguished accomplishments and/or potential to make substantial contributions to their fields.The NR45 awardees were selected through a competitive process by an award committee from the journal's editorial board.The 2021 NR45 Awards focus on the topic area of two-dimensional(2D)materials,and highlight 35 innovators in cognitions of their extraordinary contributions to this rapidly expanding field.Congratulations to all the 35 outstanding young innovators!

关键词： journal accomplishment award

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Golden hour for perovskite photonics

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Photonics Research 2020年第12期8卷 I0001-I0004页

作者： QING ZHANG CAROLE DIEDERICHS qihua xiong Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Laboratoire de Physique de l’Ecole Normale Supérieure ENSUniversitéPSLCNRSSorbonne UniversitéUniversitéde ParisF-75005 ParisFrance Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Halide perovskite semiconductors have emerged as promising candidates for the next-generation low-energy consumption,high-flexibility photonics and optoelectronic devices thanks to their superior optical and excitonic properties as well as fabrication convenience.This special issue,including three review papers and six original research papers,focuses on the studies of both fundamentals and applications of perovskite photonics,covering materials,excitonic properties,nonlinear optics,strong light–matter interactions,and optoelectronic devices.

关键词： optoelectronic Golden perovskite

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Manipulating nonlinear exciton polaritons in an atomically-thin semiconductor with artificial potential landscapes

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Light(Science & Applications) 2023年第10期12卷 2163-2171页

作者： Yuan Luo Quanbing Guo Xinyi Deng Sanjib Ghosh Qing Zhang Hongxing Xu qihua xiong State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Wuhan Institute of Quantum Technology Wuhan 430206China School of Materials Science and Engineering Peking UniversityBeijing 100871China Beijing Academy of Quantum Information Sciences Beijing 100193China School of Physics and Technology Center for Nanoscience and Nanotechnologyand Key Laboratory of Artificial Micro-and Nano-structures of Ministry of EducationWuhan UniversityWuhan 430072China Frontier Science Center for Quantum Information Beijing 100084China Collaborative Innovation Center of Quantum Matter BeijingChina

Exciton polaritons in atomically thin transition-metal dichalcogenide microcavities provide a versatile platform for advancing optoelectronic devices and studying the interacting Bosonic physics at ambient conditions.Rationally engineering the favorable properties of polaritons is critically required for the rapidly growing research.Here,we demonstrate the manipulation of nonlinear polaritons with the lithographically defined potential landscapes in monolayer WS_(2)microcavities.The discretization of photoluminescence dispersions and spatially confined patterns indicate the deterministic on-site localization of polaritons by the artificial mesa cavities.Varying the trapping sizes,the polariton-reservoir interaction strength is enhanced by about six times through managing the polariton–exciton spatial overlap.Meanwhile,the coherence of trapped polaritons is significantly improved due to the spectral narrowing and tailored in a picosecond range.Therefore,our work not only offers a convenient approach to manipulating the nonlinearity and coherence of polaritons but also opens up possibilities for exploring many-body phenomena and developing novel polaritonic devices based on 2D materials.

关键词： nonlinear potential nonlinearity

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Advanced optical gain materials keep on giving

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Science China Materials 2020年第8期63卷 1345-1347页

作者： Qing Zhang Weibo Gao qihua xiong Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

In the past few decades,there has been a long-standing pursuit to exploring emergent materials with robust optical gain and superior light-matter interacting properties for the development of photonic and optoelectron... 详细信息

关键词： pursuit optical materials

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Dynamics of exciton energy renormalization in monolayer transition metal disulfides

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Nano Research 2020年第5期13卷 1399-1405页

作者： Jiaxin Zhao Weijie Zhao Wei Du Rui Su qihua xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China

Fundamental understandings on the dynamics of charge carriers and excitonic quasiparticles in semiconductors are of central importance for both many-body physics and promising optoelectronic and photonic applications.Here,we investigated the carrier dynamics and many-body interactions in two-dimensional(2D)transition metal dichalcogenides(TMDs),using monolayer WS2 as an example,by employing femtosecond broadband pump-probe spectroscopy.Three time regimes for the exciton energy renormalization are unambiguously revealed with a distinct red-blue-red shift upon above-bandgap optical excitations.We attribute the dominant physical process in the three typical regimes to free carrier screening effect,Coulombic exciton-exciton interactions and Auger photocarrier generation,respectively,which show distinct dependence on the optical excitation wavelength,pump fluences and/or lattice temperature.An intrinsic exciton radiative lifetime of about 1.2 picoseconds(ps)in monolayer WS2 is unraveled at low temperature,and surprisingly the efficient Auger nonradiative decay of both bright and dark excitons puts the system in a nonequilibrium state at the nanosecond timescale.In addition,the dynamics of trions at low temperature is observed to be significantly different from that of excitons,e.g.,a long radiative lifetime of^108.7 ps at low excitation densities and the evolution of trion energy as a function of delay times.Our findings elucidate the dynamics of excitonic quasiparticles and the intricate many-body physics in 2D semiconductors,underpinning the future development of photonics,valleytronics and optoelectronics based on 2D semiconductors.

关键词： transitional metal disulfide exciton dynamics renormalization transient absorption spectroscopy carrier screening effect exciton-exciton interactions

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Strain-Modulated Photoelectric Responses from a Flexibleα-In_(2)Se_(3)/3R MoS_(2)Heterojunction

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Nano-Micro Letters 2021年第7期13卷 1-11页

作者： Weifan Cai Jingyuan Wang Yongmin He Sheng Liu qihua xiong Zheng Liu Qing Zhang Center for Micro-and Nano-Electronics School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 639798Singapore

Semiconducting piezoelectricα-In_(2)Se_(3) and 3R MoS_(2) have attracted tremendous attention due to their unique electronic properties.Artificial van der Waals(vdWs)hetero-structures constructed withα-In_(2)Se_(3)and 3R MoS_(2)flakes have shown promising applications in optoelectronics and photocatal-ysis.Here,we present the first flexibleα-In_(2)Se_(3)/3R MoS_(2)vdWs p-n heterojunction devices for photodetection from the visible to near infrared region.These heterojunction devices exhibit an ultrahigh photoresponsivity of 2.9×10^(3)A W^(−1) and a substantial specific detectivity of 6.2×10^(10) Jones under a compressive strain of−0.26%.The photocurrent can be increased by 64%under a tensile strain of+0.35%,due to the heterojunction energy band modulation by piezoelectric polarization charges at the hetero-junction interface.This work demonstrates a feasible approach to enhancement of α-In_(2)Se_(3)/3R MoS_(2) photoelectric response through an appropriate mechanical stimulus.

关键词： α-In_(2)Se_(3)/3R MoS_(2)heterojunction Flexible Self-powered photodetector Strain modulation Piezoelectric charge

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Lattice vibrations and Raman scattering in two- dimensional layered materials beyond graphene

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Nano Research 2016年第12期9卷 3559-3597页

作者： Xin Lu Xin Luo Jun Zhang Su Ying Quek qihua xiong Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117551 Singapore Centre for Advanced 2D Materials National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China NOVITAS Nanoelectronics Centre of Excellence School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 Singapore

We review lattice vibrational modes in atomically thin two-dimensional （2D） layered materials, focusing on 2D materials beyond graphene, such as group VI transition metal dichalcogenides, topological insulator bismuth chalcogenides, and black phosphorus. Although the composition and structure of those materials are remarkably different, they share a common and important feature, i.e., their bulk crystals are stacked via van der Waals interactions between ＂layers＂, while each layer is comprised of one or more atomic planes. First, we review the background of some 2D materials （MX2, M = Mo, W; X = S, Se, Te. Bi2X3, X = Se, Te. Black phosphorus）, including crystalline structures and stacking order. We then review the studies on vibrational modes of layered materials and nanostructures probed by the powerful yet nondestructive Raman spectroscopy technique. Based on studies conducted before 2010, recent investigations using more advanced techniques have pushed the studies of phonon modes in 2D layered materials to the atomically thin regime, down to monolayers. We will classify the recently reported general features into the following categories： phonon confinement effects and electron-phonon coupling, anomalous shifts in high-frequency intralayer vibrational modes and surface effects, reduced dimensionality and lower symmetry, the linear chain model and the substrate effect, stacking orders and interlayer shear modes, polarization dependence, and the resonance effect. Within the seven categories, both intralayer and interlayer vibrational modes will be discussed. The comparison between different materials will be provided as well.

关键词： phonon lattice vibration Raman spectroscopy two-dimensional transition metaldichalcogenide black phosphorus

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