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Boundary flat bands with topological spin textures protected by subchiral symmetry

Physical Review B 2024年第24期109卷 245402-245402页

作者： Yijie Mo Xiao-Jiao Wang Rui Yu Zhongbo Yan Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices State Key Laboratory of Optoelectronic Materials and Technologies School of Physics School of Physics and Technology Wuhan Institute of Quantum Technology Wuhan 430206 China

Chiral symmetry plays an indispensable role in topological classifications as well as in the understanding of the origin of bulk or boundary flat bands. The conventional definition of chiral symmetry refers to the existence of a constant unitary matrix anticommuting with the Hamiltonian. Since a constant unitary matrix has constant eigenvectors, boundary flat bands enforced by chiral symmetry, which share the same eigenvectors with the chiral symmetry operator, are dictated to carry fixed (pseudo)spin polarizations and be featureless in quantum geometry. In this paper, we generalize the chiral symmetry and introduce a concept termed subchiral symmetry. Unlike the conventional chiral symmetry operator defined as constant matrix, the subchiral symmetry operator depends on partial components of the momentum vector, as do its eigenvectors. We show that topological gapped or gapless systems without chiral symmetry, but with subchiral symmetry, can support boundary flat bands, which exhibit topological spin textures and quantized Berry phases. We expect that such intriguing boundary flat bands could give rise to a variety of exotic physics in the presence of interactions or disorders.

关键词： Topological phases of matter Node-line semimetals Topological insulators Topological superconductors Weyl semimetal Discrete symmetries in condensed matter Tight-binding model

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Laser polishing of a high-entropy alloy manufactured by selective laser melting

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Frontiers of Mechanical Engineering 2024年第5期19卷 73-86页

作者： Xiaojun TAN Haibing XIAO Zihong WANG Wei ZHANG Zhijuan SUN Xuyun PENG Zhongmin LIU Liang GUO Qingmao ZHANG Intelligent Manufacturing and Equipment School Shenzhen Institute of Information TechnologyShenzhen 518172China Sino-German Intelligent Manufacturing School Shenzhen City PolytechnicShenzhen 518116China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Industrial Ultrashort Pulse Laser Technology Shenzhen 518055China College of Materials Science and Engineering Chongqing UniversityChongqing 400045China

The selective laser melting(SLM)technique applied to high-entropy alloys(HEAs)has attracted considerable attention in recent ***,its practical application has been restricted by poor surface *** this study,the capability of laser polishing on the rough surface of a Co-free HEA fabricated using SLM was *** show that the initial SLM-manufactured(as-SLMed)surface of the Co-free HEA,with a roughness exceeding 3.0μm,could be refined to less than 0.5μm by laser ***,the microstructure,microhardness,and wear resistance of the laser-polished(LP-ed)zone were *** indicate that compared with the microhardness and wear resistance of the as-SLMed layer,those of the LP-ed layer decreased by 4%and 11%,respectively,because of the increase in grain size and reduction of the BCC *** study shows that laser polishing has an excellent application prospect in surface improvement of HEAs manufactured by SLM.

关键词： laser polishing selective laser melting high-entropy alloy surface roughness mechanical performance

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Five-level anti-counterfeiting based on versatile luminescence of tri-doped double perovskites

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Nano Research 2024年第11期17卷 9971-9979页

作者： Xingru Yang Yuhang Sheng Linglong Zhang Lun Yang Fangjian Xing Yunsong Di Cihui Liu Fengrui Hu Xifeng Yang Guofeng Yang Yushen Liu Zhixing Gan Center for Future Optoelectronic Functional Materials School of Computer and Electronic Information/School of Artificial Intelligence Nanjing Normal University Nanjing 210023 China College of Physics Nanjing University of Aeronautics and Astronautics Key Laboratory of Aerospace Information Materials and Physics (NUAA) MIIT Nanjing 211106 China Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi 435002 China College of Engineering and Applied Sciences and MOE Key Laboratory of Intelligent Optical Sensing and Manipulation Nanjing University Nanjing 210093 China College of Electronic and Information Engineering Changshu Institute of Technology Suzhou 215500 China School of Science Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology Jiangnan University Wuxi 214122 China Yancheng Polytechnic College Yancheng 224005 China

Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn^(2+)/Yb^(3+)/Er^(3+) tri-doped Cs2Ag0.8Na0.2InCl6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn^(2+) d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn^(2+) and Er^(3+). After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn^(2+) and Er^(3+) ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn^(2+), Ln^(3+), and traps, laying a solid foundation for future development of new lead-free perovskites.

关键词： anti-counterfeiting photoluminescence self-trapped excitons upconversion

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Organic single-crystal light-emitting transistors with external quantum efficiency over 20%

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Aggregate 2023年第4期4卷 122-127页

作者： Jian Deng Zejian Zhang Pengpeng Sang Shujun Yin Shitong Zhang Yuan Li Bing Yang Cheng Gu Yuguang Ma State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and DevicesSouth China University of TechnologyGuangzhouP.R.China School of Information Science and Engineering Shandong UniversityQingdaoP.R.China State Key Laboratory of Supramolecular Structure and Materials Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchunP.R.China Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhouP.R.China

Organic light-emitting transistors(OLETs)have attracted increasing attention because of their potential applications in next-generation displays and high-energy operating ***,the simultaneous achievement of high luminescent efficiency and carrier mobility in organic semiconductors remains challenging because the localized excitons are advantageous for light emission,whereas the delocalized carriers are beneficial for efficient charge ***,we report an organic single crystal of a cyano-substituted styrene derivative with balanced mobility yielding a record-high external quantum efficiency of 20.5%in ***-dependent I–V curves and electronic structure analyses based on firstprinciples calculations were performed to disclose the underlying mechanism as a band transport,which provides an efficient way to achieve high quantum efficiency in OLETs.

关键词： organic electronics organic light-emitting transistors single crystals styrene

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A New Metal Oxide TFTs integrated gate driver employing discharged-sweep-signal-generated module for Micro-LED analog PWM pixel circuit

A New Metal Oxide TFTs integrated gate driver employing disc...

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International Conference on Display technology, 2024

作者： Zhang, Li-Rong Zhou, Zhao-Hua Zhou, Lei Xu, Miao Wang, Lei Wu, Wei-Jing State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou510640 China Guangzhou New Vision Optoelectronic Technology Co. Ltd Guangzhou510730 China Shunde Institute of Vocational Technology Foshan520300 China

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Coherent control of the two-dimensional spatial distribution of probe absorption in a graphene-based quantum system

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Optical and Quantum Electronics 2025年第1期57卷 1-12页

作者： Badshah, Fazal Abbas, Muqaddar Zhou, Yuan Shi, Zeyun Rahmatullah School of Electrical and Information Engineering Hubei University of Automotive Technology Shiyan442000 China Ministry of Education Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Quantum Information and Quantum Optoelectronic Devices School of Physics Xian Jiaotong University Xian710049 China Quantum Optics Lab. Department of Physics COMSATS University Islamabad Pakistan

We investigate two-dimensional (2D) position-dependent probe absorption in monolayer graphene. Specifically, we consider quantized three-level graphene driven by an infrared probe field, two orthogonal terahertz standing-wave fields, and a coupling field. Our results demonstrate that the spatial distribution of probe absorption can be effectively controlled by adjusting the detunings of the probe and standing-wave fields, as well as the Rabi frequency of the coupling field. The absorption spectrum of the probe field exhibits some interesting features, such as crater-like structures and spikes. Our findings provide new insights into the manipulation of optical properties in graphene and have potential applications in solid-state quantum information. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Terahertz waves

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4D-printed snake-like biomimetic soft robots

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Bio-Design and Manufacturing 2025年第1期8卷 55-67,I0018-I0038页

作者： Xingcheng Ou Jiaqi Huang Dantong Huang Xiaohong Li Guoliang Chen Yabin Yang Ran Bi Yu Sheng Shuang-Zhuang Guo Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Guangdong Engineering Technology Research Centre for Functional BiomaterialsKey Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

Wireless millirobots engineered to infiltrate intricate vascular networks within living organisms,particularly within constricted and confined spaces,hold immense promise for the future of medical ***,with their multifaceted and intricate designs,some robots often grapple with motion and functionality issues when confronted with tight spaces characterized by small cross-sectional *** this study,drawing inspiration from the high aspect ratio and undulating swimming patterns of snakes,a millimeter-scale,snake-like robot was designed and fabricated via a combination of extrusion-based four-dimensional(4D)printing and magnetic-responsive intelligent functional inks.A sophisticated motion control strategy was also developed,which enables the robots to perform various dynamic movements,such as undulating swimming,precise turns,graceful circular motions,and coordinated cluster movements,under diverse magnetic field *** a potential application,the snake robot can navigate and release drugs in a model coronary intervention vessel with tortuous channels and fluid *** novel design and promising applications of this snake robot are invaluable tools in future medical surgeries and interventions.

关键词： 4D printing Magnetic-responsive ink Untethered medical soft robot Snake-like robot Drug delivery

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Design of high performance multi-notch filters based on photonic crystal nanorod flower-shaped resonators

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optoelectronics Letters 2025年

作者： YAN WEI ZHANG SHUANGGEN ZHANG WEIWEI Tianjin Key Laboratory of Film Electronic and Communication Devices， Engineering Research Center of Optoelectronic Devices and Communication Technology， Ministry of Education， School of Integrated Circuit Science and Engineering， Tianjin University of Technology

Photonic crystal notch filter plays a vital role in photonics applications which can selectively attenuate the unwanted interference. However， it remains challenging to achieve high efficiency and is generally limited to the single notch performance. Here， we demonstrated a high efficient all-silicon multi-notch filter scheme utilizing photonic crystal nanorod flower-shaped resonators. Based on the single resonant cavity， the dielectric columns can be introduced to create the intracavity asymmetry achieving double notch， meanwhile by adding the certain scattering nanorods to trap light efficiently， it can also obtain triple notch. The results emanate that the transmission and the Q of single notch up to 2.6% and 16209.4， double notch 0.5%， 0.1% and 12371.7，13934.5， triple notch 0.2%， 0.5%， 2.3%， 2312.9， 2062.8， 2327.4 can be achieved， respectively. The proposed high efficient multi-notch filters could potentially catalyze advancements in filter technology within the realm of silicon photonics applications and optical communication.

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Multi-Color Tungsten Oxide Reflection Electrochromic Device for Display

Multi-Color Tungsten Oxide Reflection Electrochromic Device ...

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International Conference on Display technology, ICDT 2022

作者： Yao, Rihui Shi, Muyang Zhang, Guanguang Zou, Wenxin Guo, Chenxiao Wu, Zhenyu Zhang, Kangping Jiang, Yasi Ning, Honglong Peng, Junbiao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou510640 China

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Ultralow-Temperature Heat Transport Evidence for Residual Density of States in the Superconducting State of CsV_(3)Sb_(5 )

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Chinese Physics Letters 2024年第12期41卷 141-148页

作者： C.C.Zhao L.S.Wang W.Xia Q.W.Yin H.B.Deng G.W.Liu J.J.Liu X.Zhang J.M.Ni Y.Y.Huang C.P.Tu Z.C.Tao Z.J.Tu C.S.Gong Z.W.Wang H.C.Lei Y.F.Guo X.F.Yang J.X.Yin S.Y.Li State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200438China Shanghai Research Center for Quantum Sciences Shanghai 201315China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics Shanghai 201210China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China Department of Physics Southern University of Science and TechnologyShenzhen 518055China Center for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Shanghai Branch Hefei National LaboratoryShanghai 201315China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

V-based kagome superconductors AV_(3)Sb_(5)(A=K,Rb,and Cs)host a charge density wave(CDW)and a topological nontrivial band structure,thereby providing a great platform to study the interplay of superconductivity(SC),CDW,frustration,and ***,we report ultralow-temperature thermal conductivity measurements of CsV_(3)Sb_(5 ) and Ta-doped Cs((V_(0.86)Ta_(0.14)))_(3)Sb_(5) and scanning tunneling microscopy(STM)measurements of CsV_(3)Sb_(5 ).The finite residual linear term of thermal conductivity at zero magnetic field suggests the existence of a residual density of states(DOS)in the superconducting state of CsV_(3)Sb_(5 ).This is supported by the observation of non-zero conductance at zero bias in STM spectrum at an electronic temperature of 90 ***,in Cs(V_(0.86)Ta_(0.14))_(3)Sb_(5),which does not have CDW order,there is no evidence for the residual *** results show the importance of CDW order for the residual DOS,and that a nodal s-wave gap or residual Fermi arc may be the origin of the residual DOS in such an unusual multiband kagome superconductor,CsV_(3)Sb_(5 ).

关键词： thereby conductivity

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