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Low-threshold topological nanolasers based on the second-order corner state

Light(Science & Applications) 2020年第1期9卷 968-973页

作者： Weixuan Zhang Xin Xie Huiming Hao jianchen dang Shan Xiao Shushu Shi Haiqiao Ni Zhichuan Niu Can Wang Kuijuan Jin Xiangdong Zhang Xiulai Xu Key Laboratory of advanced optoelectronic quantum architecture and measurements of Ministry of Education School of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems Micro-nano CenterSchool of PhysicsBeijing Institute of Technology100081 BeijingChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of SciencesBeijing 100083China Songshan Lake Materials Laboratory DongguanGuangdong 523808China

Topological lasers are immune to imperfections and *** have been recently demonstrated based on many kinds of robust edge states,which are mostly at the *** realization of 2D on-chip topological nanolasers with a small footprint,a low threshold and high energy efficiency has yet to be ***,we report the first experimental demonstration of a topological nanolaser with high performance in a 2D photonic crystal slab.A topological nanocavity is formed utilizing the Wannier-type 0D corner *** behaviour with a low threshold of approximately 1μW and a high spontaneous emission coupling factor of 0.25 is observed with quantum dots as the active *** performance is much better than that of topological edge lasers and comparable to that of conventional photonic crystal *** experimental demonstration of a low-threshold topological nanolaser will be of great significance to the development of topological nanophotonic circuitry for the manipulation of photons in classical and quantum regimes.

关键词： quantum utilizing realization

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Anisotropies of the g-factor tensor and diamagnetic coefficient in crystal-phase quantum dots in InP nanowires

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Nano Research 2019年第11期12卷 2842-2848页

作者： Shiyao Wu Kai Peng Sergio Battiato Valentina Zannier Andrea Bertoni Guido Goldoni Xin Xie Jingnan Yang Shan Xiao Chenjiang Qian Feilong Song Sibai Sun jianchen dang Yang Yu Fabio Beltram Lucia Sorba Ang Li Bei-bei Li Francesco Rossella Xiulai Xu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing100049China Laboratorio NEST Scuola Normale Superiore and Istituto Nanoscienze-CNRPiazza S.Silvestro 12I-56127PisaItaly S3 Istituto Nanoscienze-CNRVia Campi 213/aModena41125Italy Dipartimento di Scienze Fisiche Informatiche e MatematicheUniversitàdegli Studi di Modena e Reggio EmiliaVia Campi 213/aModena41125Italy Beijing Key Lab of Microstructure and Property of Advanced Materials Beijing University of TechnologyPingleyuan No.100Beijing100024China Songshan Lake Materials Laboratory Dongguan523808China

Crystal-phase low-dimensional structures offer great potential for the implementation of photonic devices of interest for quantum information *** this context,unveiling the fundamental parameters of the crystal phase structure is of much relevance for several ***,we report on the anisotropy of the g-factor tensor and diamagnetic coefficient in wurtzite/zincblende(WZ/ZB)crystal-phase quantum dots(QDs)realized in single InP *** WZ and ZB alternating axial sections in the NWs are identified by high-angle annular dark-field scanning transmission electron *** electron(hole)g-factor tensor and the exciton diamagnetic coefficients in WZ/ZB crystal-phase QDs are determined through micro-photoluminescence measurements at low temperature(4.2 K)with different magnetic field configurations,and rationalized by invoking the spin-correlated orbital current *** work provides key parameters for band gap engineering and spin states control in crystal-phase low-dimensional structures in nanowires.

关键词： g-factor tensor diamagnetic coefficient crystal-phase quantum dot InP NWs

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Diabolical points in coupled active cavities with quantum emitters

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Light(Science & Applications) 2020年第1期9卷 1943-1950页

作者： Jingnan Yang Chenjiang Qian Xin Xie Kai Peng Shiyao Wu Feilong Song Sibai Sun jianchen dang Yang Yu Shushu Shi Jiongji He Matthew JSteer Iain GThayne Bei-Bei Li Fang Bo Yun-Feng Xiao Zhanchun Zuo Kuijuan Jin Changzhi Gu Xiulai Xu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Engineering University of GlasgowGlasgow G128LTUK The MOE Key Laboratory of Weak Light Nonlinear Photonics TEDA Applied Physics Institute and School of PhysicsNankai UniversityTianjin 300457China State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter School of PhysicsPeking UniversityBeijingChina Songshan Lake Materials Laboratory Dongguan 523808 GuangdongChina

In single microdisks,embedded active emitters intrinsically affect the cavity modes of the microdisks,resulting in trivial symmetric backscattering and low *** we demonstrate macroscopic control of the backscattering direction by optimizing the cavity *** signature of the positive and negative backscattering directions in each single microdisk is confirmed with two strongly coupled ***,diabolical points are achieved at the resonance of the two microdisks,which agrees well with theoretical calculations considering the backscattering *** points in active optical structures pave the way for an implementation of quantum information processing with geometric phase in quantum photonic networks.

关键词： quantum backscattering directions

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Large Photoluminescence Enhancement by an Out-of-Plane Magnetic Field in Exfoliated WS2 Flakes

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Chinese Physics Letters 2020年第8期37卷 156-161页

作者： Sibai Sun jianchen dang Xin Xie Yang Yu Longlong Yang Shan Xiao Shiyao Wu Kai Peng Feilong Song Yunuan Wang Jingnan Yang Chenjiang Qian Zhanchun Zuo Xiulai Xu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Luminescence and Optical Information(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044China Songshan Lake Materials Laboratory Dongguan 523808China

We report an out-of-plane magnetic field induced large photoluminescence enhancement in WS2 flakes at 4K,in contrast to the photoluminescence enhancement provided by an in-plane field in *** mechanisms for the enhancement are *** is a larger overlap of the electron and hole caused by the magnetic field induced *** other is that the energy difference between varLambda and K valleys is reduced by magnetic field,and thus enhancing the corresponding indirect-transition ***,the Landé g factor of the trion is measured to be-0.8,whose absolute value is much smaller than normal exciton,which is around-4.A model for the trion gfactor is presented,confirming that the smaller absolute value of the Landé g factor is a behavior of this A–*** extending the valley space,we believe this work provides a further understanding of the valleytronics in monolayer transition metal dichalcogenides.

关键词： WS2 valley absolute

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Nanograting‑Based Dynamic Structural Colors Using Heterogeneous Materials

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Nano-Micro Letters 2025年第3期17卷 138-151页

作者： Jingang Wang Haibo Yu jianchen Zheng Yuzhao Zhang Hongji Guo Ye Qiu Xiaoduo Wang Yongliang Yang Lianqing Liu State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

Dynamic structuralcolors can change in response todifferent environmental *** ability remains effectiveeven when the size of the speciesresponsible for the structural coloris reduced to a few micrometers,providing a promising sensingmechanism for solving microenvironmentalsensing problems inmicro-robotics and ***, the lack of dynamicstructural colors that can encoderapidly, easily integrate, and accuratelyreflect changes in physical quantities hinders their use in microscale sensing applications. Herein, we present a 2.5-dimensionaldynamic structural color based on nanogratings of heterogeneous materials, which were obtained by interweaving a pH-responsive hydrogelwith an IP-L photoresist. Transverse gratings printed with pH-responsive hydrogels elongated the period of longitudinal grating in the swollenstate, resulting in pH-tuned structural colors at a 45° incidence. Moreover, the patterned encoding and array printing of dynamic structuralcolors were achieved using grayscale stripe images to accurately encode the periods and heights of the nanogrid structures. Overall, dynamicstructural color networks exhibit promising potential for applications in information encryption and in situ sensing for microfluidic chips.

关键词： Dynamic structural colors Four-dimensional printing pH-responsive Nanogrid Heterogeneous materials

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反不正当竞争法一般条款的适用

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清华法学 2025年第1期19卷 5-25页

作者：王利明刘建臣中国人民大学民商事法律科学研究中心中国人民大学法学院山东大学法学院

当前司法实践极其依赖反不正当竞争法一般条款对新型不正当竞争行为作出评判,但该条款的模糊道德话语难以为司法者提供清晰指引,致使不同法院的裁判标准不一,甚至出现对立性裁判观点。依据商业道德认定不正当竞争的进路存在明显缺陷,应... 详细信息

当前司法实践极其依赖反不正当竞争法一般条款对新型不正当竞争行为作出评判,但该条款的模糊道德话语难以为司法者提供清晰指引,致使不同法院的裁判标准不一,甚至出现对立性裁判观点。依据商业道德认定不正当竞争的进路存在明显缺陷,应在借鉴侵权法的基础上将一般条款要件化对待,并在适用一般条款时,综合考量竞争关系、权益侵害、违法性和过错四个具体构成要件,以此评判被诉行为是否具有不正当性。竞争关系发挥着区分法律适用和确认原告起诉资格的功能,权益侵害则以经营者存在反不正当竞争法所保护的合法权益和所承认的损害类型为限,违法性强调被诉行为违反了法律法规、行业准则或良性商业惯例所确立的义务,过错则表征着被告具有侵害他人权益的主观故意或因违反职业审慎义务而存在过失。构成要件范式可为司法者的个案裁判提供更为具象的指引,进而有利于实现裁判标准的统一。

关键词：不正当竞争一般条款构成要件违法性职业审慎

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基于逻辑框图的卫星健康评估方法

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计算机测量与控制 2020年第2期28卷 267-273页

作者：朱昶文党建成张明良张发家庄建昆上海卫星工程研究所

针对目前无法准确量化反映在轨卫星健康状态的问题,提出一种基于卫星部组件逻辑连接关系的健康状态分层评估模型,用任务健康度和任务风险度定量表示卫星状态;在部件层,选取关键遥测参数指标,通过统计历史健康数据及查阅设计资料建立部... 详细信息

针对目前无法准确量化反映在轨卫星健康状态的问题,提出一种基于卫星部组件逻辑连接关系的健康状态分层评估模型,用任务健康度和任务风险度定量表示卫星状态;在部件层,选取关键遥测参数指标,通过统计历史健康数据及查阅设计资料建立部件级非线性无量纲评估模型;在组件层,通过各部件的逻辑连接关系分别建立评估模型;在分系统层,利用组件层得到的结果及各组件的逻辑连接关系,结合模糊层次分析(fuzzy analytic hierarchy process,FAHP)和变权理论,建立分系统健康状态评估模型;最后,通过某卫星正常运行时期和异常运行时期的在轨遥测数据验证,结果表明,该评估模型具有正确性。

关键词：卫星健康状态评估非线性无量纲评估模型模糊层次分析法变权理论

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A SMOOTHING LEVENBERG-MARQUARDT TYPE METHOD FOR LCP

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Journal of Computational Mathematics 2004年第5期22卷 735-752页

作者： Ju-liangZhang jianchen DepartmentofManagementScience SchoolofEconomicsandManagementTsinghuaUniversityBeijing100083China

In this paper, we convert the linear complementarity problem to a system of semismooth nonlinear equations by using smoothing technique. Then we use Levenberg-Marquardt type method to solve this system. Taking advantage of the new results obtained by Dan, Yamashita and Fukushima [11, 33], the global and local superlinear convergence properties of the method are obtained under very mild conditions. Especially, the algorithm is locally superlinearly convergent under the assumption of either strict complementarity or certain nonsingularity. Preliminary numerical experiments are reported to show the efficiency of the algorithm.

关键词： LCP Levenberg-Marquardt method P matrix Smoothing technique Superlinear convergence

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Fluorescence microscope light source based on integrated LED

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Light(Science & Applications) 2023年第10期12卷 1990-1991页

作者： jianchen Zi Hai Bi Jihua Laboratory No.28 Huandao South RoadNanhai district528200FoshanChina

An LED-integrated excitation cube(LEC)was designed to address the limitations of conventional fluorescence *** LEC has a decentralized structure,high optical power density,and efficient *** optical efficiency of LECs is 1–2 orders of magnitude higher than that of mercury lamps,enabling high-quality fluorescence imaging with spectral coverage from UV to *** can be easily installed on commercial fluorescence microscopes by replacing conventional fluorescence filter cubes,and a built-in LEC driver can identify the types of LEDs in different spectral bands to adopt optimal operating conditions.

关键词： Fluorescence illumination mercury

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A CONSTRAINED OPTIMIZATION APPROACH FOR LCP

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Journal of Computational Mathematics 2004年第4期22卷 509-522页

作者： Ju-liangZhang jianchen Xin-jianZhuo DepartmentofManagementScienceandEngineering SchoolofEconomicsandManagementTsinghuaUniversityBeijing100084China SchoolofInformationEngineering BeijingUniversityofpostsandTelecommunicationBeijing100876China

In this paper, LCP is converted to an equivalent nonsmooth nonlinear equation system H(x,y) = 0 by using the famous NCP function-Fischer-Burmeister function. Note that some equations in H(x, y) = 0 are nonsmooth and nonlinear hence difficult to solve while the others are linear hence easy to solve. Then we further convert the nonlinear equation system H(x, y) = 0 to an optimization problem with linear equality constraints. After that we study the conditions under which the K-T points of the optimization problem are the solutions of the original LCP and propose a method to solve the optimization problem. In this algorithm, the search direction is obtained by solving a strict convex programming at each iterative point, However, our algorithm is essentially different from traditional SQP method. The global convergence of the method is proved under mild conditions. In addition, we can prove that the algorithm is convergent superlinearly under the conditions: M is P0 matrix and the limit point is a strict complementarity solution of LCP. Preliminary numerical experiments are reported with this method.

关键词： LCP Nonsmooth equation system Po matrix Strict complementarity Super-linear convergence

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