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Spin‑controlled topological phase transition in non‑Euclidean space

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Frontiers of Optoelectronics 2024年第1期17卷 67-76页

作者： Zhuochen Du Jinze Gao Qiuchen Yan Cuicui Lu Xiaoyong HU Qihuang Gong State Key Laboratory for Mesoscopic Physics and Department of Physics Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano‑OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China

Modulation of topological phase transition has been pursued by researchers in both condensed matter and optics research fields,and has been realized in Euclidean systems,such as topological photonic crystals,topological metamaterials,and coupled resonator arrays.However,the spin-controlled topological phase transition in non-Euclidean space has not yet been explored.Here,we propose a non-Euclidean configuration based on Mobius rings,and we demonstrate the spin-controlled transition between the topological edge state and the bulk state.The Mobius ring,which is designed to have an 8πperiod,has a square cross section at the twist beginning and the length/width evolves adiabatically along the loop,accompanied by conversion from transverse electric to transverse magnetic modes resulting from the spin-locked effect.The 8πperiod Mobius rings are used to construct Su–Schrieffer–Heeger configuration,and the configuration can support the topological edge states excited by circularly polarized light,and meanwhile a transition from the topological edge state to the bulk state can be realized by controlling circular polarization.In addition,the spin-controlled topological phase transition in non-Euclidean space is feasible for both Hermitian and non-Hermitian cases in 2D systems.This work provides a new degree of polarization to control topological photonic states based on the spin of Mobius rings and opens a way to tune the topological phase in non-Euclidean space.

关键词： Topological phase transition Non-Euclidean space Möbius ring Spin-locked effect

Photonic crystal and topological photonics provide new modulation degrees of freedom

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Frontiers of Optoelectronics 2020年第1期13卷 1-1页

作者： Xiaoyong HU State Key Laboratory for Mesoscopic Physics&Department of Physics Collaborative Innovation Center of Quantum MatterBeijing Academy of Quantum Information SciencesNano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Photonic crystals offer a platform for manipulating light at the mesoscopic scale owing to the unique photonic bandgap properties originating from spatially periodic dielectric distributions.Not only various integrated photonic devices have been realized based on photonic crystals,such as photonic crystal laser and logic devices,but also many physical effects including negative refractive and optical cloak have been realized in photonic crystals.Based on the photonic band structure,topological photonics has been an emerging research hotspot nowadays.Topological photonics provide two new modulation degrees of freedom,i.e.,topological state degrees of freedom and energy valley degrees of freedom.It can be expected that topological photonics will not only boost the fundamental study of physical effects and phenomena,but also improve the research of high-performance photonic devices.

关键词： crystal topological photonics

A scheme for realizing nonreciprocal interlayer coupling in bilayer topological systems

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Frontiers of Optoelectronics 2023年第4期16卷 71-80页

作者： Xiaoxiao Wang Ruizhe Gu Yandong Li huixin Qi Xiaoyong HU Xingyuan Wang Qihuang Gong State Key Laboratory for Mesoscopic Physics and Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Nonreciprocal interlayer coupling is difcult to practically implement in bilayer non-Hermitian topological photonic systems.In this work,we identify a similarity transformation between the Hamiltonians of systems with nonreciprocal interlayer coupling and on-site gain/loss.The similarity transformation is widely applicable,and we show its application in one-and two-dimensional bilayer topological systems as examples.The bilayer non-Hermitian system with nonreciprocal interlayer coupling,whose topological number can be defned using the gauge-smoothed Wilson loop,is topologically equivalent to the bilayer system with on-site gain/loss.We also show that the topological number of bilayer non-Hermitian C6v-typed domaininduced topological interface states can be defned in the same way as in the case of the bilayer non-Hermitian Su–Schrieffer–Heeger model.Our results show the relations between two microscopic provenances of the non-Hermiticity and provide a universal and convenient scheme for constructing and studying nonreciprocal interlayer coupling in bilayer non-Hermitian topological systems.This scheme is useful for observation of non-Hermitian skin efect in three-dimensional systems.

关键词： Nonreciprocal Bilayer Interlayer coupling Topological photonics

Nanoscale all-optical devices based on surface plasmon polaritons

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Chinese Science Bulletin 2014年第22期59卷 2661-2665页

作者： Jianjun Chen Chengwei Sun Xiaoyong HU State Key Laboratory for Mesoscopic Physics & Department of Physics Peking University Collaborative Innovation Center of Quantum Matter

Surface plasmon polariton,a kind of surface electromagnetic wave propagating along the interface between metals and dielectrics,provides an excellent platform for the realization of integrated photonic devices due to its unique properties of confining light into subwavelength scales.Our recent research progresses of nanoscale integrated photonic devices based on surface plasmon polaritons,including all-optical switches,all-optical logic discriminator,and all-optical routers,are introduced in detail.

关键词：表面等离子体激元全光器件纳米光子器件全光路由器波的传播全光开关全光逻辑

Clinical features of Chinese psoriatic patients for early referral of arthritis using psoriasis epidemiology screening tool:A cross-sectional analysis from the registry database of Chinese Psoriasis Standardized Diagnosis and Treatment Center

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Chinese Medical Journal 2023年第16期136卷 1999-2001页

作者： Ping Xia Jinbo Chen Mei Yang Jing Dong xiaoyong Zhou Feng hu Liuqing Chen Department of Dermatology Wuhan No.1 HospitalWuhanHubei 430022China National Clinical Research Center for Skin and Immune Diseases Beijing 100034China

To the Editor:Psoriatic arthritis(PsA)is a type of arthritic condition that occurs in patients with psoriasis.Early identification of patients at risk and the knowledge of risk factors is crucial for dermatologists.The Chinese Psoriasis Standardized Diagnosis and Treatment Center(CPSDTC)registry database is a prospective,multicenter cohort study launched by the Peking University First Hospital in July 2020 to gather clinical information on Chinese patients with psoriasis.Our study aimed to report the clinical features of Chinese psoriatic patients using the Psoriasis Epidemiology Screening Tool(PEST)for the early referral of arthritis.

关键词： patients psoriasis epidemiology

High performance integrated photonic circuit based on inverse design method

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Opto-Electronic Advances 2022年第10期5卷 22-34页

作者： huixin Qi Zhuochen Du Xiaoyong HU Jiayu Yang Saisai Chu Qihuang Gong State Key Laboratory for Mesoscopic Physics&Department of Physics Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-optoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

The basic indexes of all-optical integrated photonic circuits include high-density integration,ultrafast response and ultralow energy consumption.Traditional methods mainly adopt conventional micro/nano-structures.The overall size of the circuit is large,usually reaches hundreds of microns.Besides,it is difficult to balance the ultrafast response and ultra-low energy consumption problem,and the crosstalk between two traditional devices is difficult to overcome.Here,we propose and experimentally demonstrate an approach based on inverse design method to realize a high-density,ultrafast and ultra-low energy consumption integrated photonic circuit with two all-optical switches controlling the input states of an all-optical XOR logic gate.The feature size of the whole circuit is only 2.5μm×7μm,and that of a single device is 2μm×2μm.The distance between two adjacent devices is as small as 1.5μm,within wavelength magnitude scale.Theoretical response time of the circuit is 150 fs,and the threshold energy is within 10 fJ/bit.We have also considered the crosstalk problem.The circuit also realizes a function of identifying two-digit logic signal results.Our work provides a new idea for the design of ultrafast,ultra-low energy consumption all-optical devices and the implementation of high-density photonic integrated circuits.

关键词： all-optical integrated photonic circuit inverse design all-optical switch all-optical XOR logic gate

A Novel Multi-Hop Algorithm for Wireless Network with Unevenly Distributed Nodes

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Computers, Materials & Continua 2019年第1期58卷 79-100页

作者： Yu Liu Zhong Yang xiaoyong Yan Guangchi Liu Bo hu School of Computer Engineering Jinling Institute of TechnologyNanjing211169China School of Intelligence Science and Control Engineering Jinling Institute of TechnologyNanjing211169China School of Modern Post&Institute of Modern Posts Nanjing University of Posts and TelecommunicationsNanjing210003China Stratifyd Inc. CharlotteNC 28208USA Center of Information Construction and Management Nanjing Normal University of Special EducationNanjing210038China

Node location estimation is not only the promise of the wireless network for target recognition,monitoring,tracking and many other applications,but also one of the hot topics in wireless network research.In this paper,the localization algorithm for wireless network with unevenly distributed nodes is discussed,and a novel multi-hop localization algorithm based on Elastic Net is proposed.The proposed approach is formulated as a regression problem,which is solved by Elastic Net.Unlike other previous localization approaches,the proposed approach overcomes the shortcomings of traditional approaches assume that nodes are distributed in regular areas without holes or obstacles,therefore has a strong adaptability to the complex deployment environment.The proposed approach consists of three steps:the data collection step,mapping model building step,and location estimation step.In the data collection step,training information among anchor nodes of the given network is collected.In mapping model building step,the mapping model among the hop-counts and the Euclidean distances between anchor nodes is constructed using Elastic Net.In location estimation step,each normal node finds its exact location in a distributed manner.Realistic scenario experiments and simulation experiments do exhibit the excellent and robust location estimation performance.

关键词： Multi-hop localization Elastic Net regularization sparse

Geochemistry and geochronology of Late Jurassic and Early Cretaceous intrusions related to some Au(Sb) deposits in southern Anhui: a case study and review

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Acta Geochimica 2018年第3期37卷 360-383页

作者： Qing hu huangling Gu xiaoyong Yang Yisu Ren Ergen Gao Zhangxing Nie CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of China College of Civil Engineering Anhui Jianzhu University No.311 Geological Team Anhui Bureau of Geology and Mineral Resources Exploration

Some Au deposits in southern Anhui Province have recently been found to be closely associated with Late Mesozoic intrusions. Typical examples include the huashan Au(Sb) deposit and Au deposits at Zhaojialing, Wuxi,and Liaojia. In order to understand the mechanisms that led the formation of these Au deposits, we make detailed reviews on the geological characteristics of these Au deposits. Specifically, we present new LA-ICP-MS zircon U–Pb dating, along with elemental and Hf isotopic data from the huashan Au(Sb) deposit. Our data suggests that the huashan ore-related intrusions were emplaced during the Late Jurassic and Early Cretaceous periods(144–148 Ma). They are characterized by arc-magma features and high oxygen fugacity and are rich in inherited zircons. Zircon U–Pb ages and Lu–Hf isotopes from intrusions suggest that Proterozoic juvenile lithosphere is the main source of these intrusions. The regional geological history implies that lithosphere beneath southern Anhui was produced during a Proterozoic subduction and was fertilized with Au(Cu) in the process. Integrated with theresults of previous studies, we inferred that Late Mesozoic intrusions formed by the remelting of the lithosphere could provide the metal endowment for the Au-rich deposits in southern Anhui.

关键词： Yanshannian magmatism Subduction-modified lithosphere Au (Sb) deposits Southern Anhui South China

Optical studies of semiconductor perovskite nanocrystals for classical optoelectronic applications and quantum information technologies: a review

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Advanced Photonics 2020年第5期2卷 11-25页

作者： Zengle Cao Fengrui hu Chunfeng Zhang Shining Zhu Min Xiao xiaoyong Wang Nanjing University College of Engineering and Applied SciencesSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNational Laboratory of Solid State MicrostructuresNanjingChina University of Arkansas Department of PhysicsFayettevilleArkansasUnited States

Semiconductor perovskite films are now being widely investigated as light harvesters in solar cells with ever-increasing power conversion efficiencies,which have motivated the fabrication of other optoelectronic devices,such as light-emitting diodes,lasers,and photodetectors.Their superior material and optical properties are shared by the counterpart colloidal nanocrystals(NCs),with the additional advantage of quantum confinement that can yield size-dependent optical emission ranging from the near-UV to near-infrared wavelengths.So far,intensive research efforts have been devoted to the optical characterization of perovskite NC ensembles,revealing not only fundamental exciton relaxation and recombination dynamics but also lowthreshold amplified spontaneous emission and novel superfluorescence effects.Meanwhile,the application of single-particle spectroscopy techniques to perovskite NCs has helped to resolve a variety of optical properties for which there are few equivalents in traditional colloidal NCs,mainly including nonblinking photoluminescence,suppressed spectral diffusion,stable exciton fine structures,and coherent singlephoton emission.While the main purpose of ensemble optical studies is to guide the smooth development of perovskite NCs in classical optoelectronic applications,the rich observations from single-particle optical studies mark the emergence of a potential platform that can be exploited for quantum information technologies.

关键词： perovskite nanocrystals optical studies single-particle spectroscopy transient absorption optoelectronic applications quantum information technologies