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Time-dependent density-functional theory molecular-dynamics study on amorphization of Sc-Sb-Te alloy under optical excitation

引用

npj Computational Materials 2020年第1期6卷 1376-1380页

作者： Xue-Peng Wang Xian-Bin Li Nian-Ke Chen Junhyeok Bang Ryky Nelson Christina Ertural Richard Dronskowski Hong-Bo Sun Shengbai Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University130012 ChangchunChina Department of Physics Chungbuk National University28644 ChungbukRepublic of Korea Institute of Inorganic Chemistry RWTH Aachen University52056 AachenGermany Hoffmann Institute of Advanced Materials Shenzhen Polytechnic518055 ShenzhenChina State Key Lab of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua Univerwsity100084 BeijingChina Department of Physics Applied Physicsand AstronomyRensselaer Polytechnic InstituteTroyNY 12180USA

Recently,all-optical memory and optical-computation properties of phase-change materials are receiving intensive *** writing/erasing information in these devices is usually achieved by laser pulses,the interaction between the laser and the phase-change materials becomes a key issue for such new *** this work,by a time-dependent density-functional theory molecular-dynamics study,the physics underlying the optical excitation induced amorphization of Sc-Sb-Te is revealed,which goes back to superatom-like Sc-centered structural *** motifs are found to be still robust under the excitation.

关键词： optical excitation theory

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Intermediate anomalous Hall states induced by noncollinear spin structure in the magnetic topological insulator MnBi2Te4

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Physical Review B 2021年第5期104卷 054409-054409页

作者： Jing-Zhi Fang Shuo Wang Xing-Guo Ye Ben-Chuan Lin An-Qi Wang Hao-Nan Cui Jian-Kun Wang Guang-Yu Zhu Song Liu Yongkai Li Zhiwei Wang Yugui Yao Zhongming Wei Dapeng Yu Zhi-Min Liao Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences & Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100083 China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing 100871 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing 100081 China Micronano Center Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China

The combination of topology and magnetism is attractive to produce exotic quantum matters, such as the quantum anomalous Hall state, axion insulators, and the magnetic Weyl semimetals. MnBi2Te4, as an intrinsic magnetic topological insulator, provides a platform for the realization of various topological phases. Here we report the intermediate Hall steps in the magnetic hysteresis of MnBi2Te4, where four distinguishable magnetic memory states at zero magnetic field are revealed. The gate and temperature dependence of the magnetic intermediate states indicates the noncollinear spin structure in MnBi2Te4, which can be attributed to the Dzyaloshinskii-Moriya interaction as the coexistence of strong spin-orbit coupling and local inversion symmetry breaking on the surface. Moreover, these multiple magnetic memory states can be programmatically switched among each other through applying designed pulses of magnetic field. Our results provide some insights of the influence of bulk topology on the magnetic states, and the multiple memory states should be promising for spintronic devices.

关键词： Anomalous Hall effect Magnetism Topological materials

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Discovery of smectic charge and pair-density-wave orders in topological monolayer 1T′-MoTe2

arXiv

引用

arXiv 2023年

作者： Wei, Li-Xuan Xiao, Peng-Cheng Li, Fangsen Wang, Li Deng, Bo-Yuan Cheng, Fang-Jun Zheng, Fa-Wei Hao, Ning Zhang, Ping Ma, Xu-Cun Xue, Qi-Kun Song, Can-Li State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China School of Physics and Physical Engineering Qufu Normal University Qufu273165 China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou215123 China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement School of Physics Beijing Institute of Technology Beijing100081 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei230031 China Institute of Applied Physics and Computational Mathematics Beijing100088 China Frontier Science Center for Quantum Information Beijing100084 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Beijing Academy of Quantum Information Sciences Beijing100193 China

Symmetry-breaking phenomena are observed in numerous strongly-correlated systems including high-temperature superconductors. However, identifying these exotic phases and understanding their interplay with superconductivity in topological materials remain challenging. Here we employ a cryogenic scanning tunneling microscopy to discover a unidirectional (striped) charge order (CO) and a primary pair-density-wave (PDW) in topological monolayer 1T′-MoTe2. The two orders are spatially modulated uniaxially and share the same periodicity of five-unit cells or a wavevector QC ͌ QP ͌ (0, 0.4)π/b (b is the lattice constant along the Mo chains). Importantly, the primary PDW state features a two-gap superconductivity below the transition temperature of 6.0 K and induces another unique particle-hole-symmetric CO at twice the PDW wavevector. Combining these results and our density functional calculations, we reveal that the two striped orders are primarily driven by nesting behaviors between electron and hole pockets. Our findings establish monolayer 1T′-MoTe2 as a topological paradigm for exploring multiple preexisting symmetry-breaking states. © 2023, CC BY.

关键词： Monolayers

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Intermediate anomalous Hall states induced by noncollinear spin structure in magnetic topological insulator MnBi2Te4

arXiv

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arXiv 2021年

作者： Fang, Jing-Zhi Wang, Shuo Ye, Xing-Guo Lin, Ben-Chuan Wang, An-Qi Cui, Hao-Nan Wang, Jian-Kun Zhu, Guang-Yu Liu, Song Li, Yongkai Wang, Zhiwei Yao, Yugui Wei, Zhongming Yu, Dapeng Liao, Zhi-Min Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100083 China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing100871 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Micronano Center Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China

The combination of topology and magnetism is attractive to produce exotic quantum matters, such as the quantum anomalous Hall state, axion insulators and the magnetic Weyl semimetals. MnBi2Te4, as an intrinsic magnetic topological insulator, provides a platform for the realization of various topological phases. Here we report the intermediate Hall steps in the magnetic hysteresis of MnBi2Te4, where four distinguishable magnetic memory states at zero magnetic field are revealed. The gate and temperature dependence of the magnetic intermediate states indicates the noncollinear spin structure in MnBi2Te4, which can be attributed to the Dzyaloshinskii-Moriya interaction as the coexistence of strong spin-orbit coupling and local inversion symmetry breaking on the surface. Moreover, these multiple magnetic memory states can be programmatically switched among each other through applying designed pulses of magnetic field. Our results provide new insights of the influence of bulk topology on the magnetic states, and the multiple memory states should be promising for spintronic devices. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic fields

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Emerging contaminants:A One Health perspective

引用

The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental Science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

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Transverse Patterns and Dual-Frequency Lasing in a Low-Noise Nonplanar-Ring Orbital-Angular-Momentum Oscillator

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Physical Review Applied 2020年第2期13卷 024067-024067页

作者： Yaqin Cao Ping Liu Cuifang Hou Yanne K. Chembo Zehuang Lu Guoping Lin MOE Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Institute for Research in Electronics and Applied Physics (IREAP) and Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742 USA Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen 518055 China

Monolithic optical cavities employing total internal reflections are appealing compact platforms for a wide range of applications from fundamental physics to industry applications. We characterize the transverse patterns of a millimeter-size monolithic nonplanar ring vortex laser pumped by a Gaussian beam. Vortex beams carrying orbital angular momentum (OAM) up to 30 together with vortex crystals and petal patterns are observed. The rigid nature of the monolithic cavity brings along its low-noise lasing performance for these beams. A frequency noise floor as low as 0.1Hz/Hz1/2 corresponding to sub-Hz instantaneous linewidth is measured. Furthermore, we demonstrate low-noise dual-frequency lasing with phase noise as low as −118dBc/Hz at 10-kHz offset for the beatnote at 8.2 GHz. We expect that such versatile and compact OAM laser sources can facilitate multiple applications including optical communications, optical tweezers, and laser metrology such as dual-frequency Doppler lidar.

关键词： Angular momentum of light Optical quantum information processing Optical sources & detectors Optical vortices Photonics Solid state lasers Spatial profiles of optical beams Cavity resonators

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Fault-tolerant control of a 2-DOF robot manipulator using multi-sensor switching strategy 36

Fault-tolerant control of a 2-DOF robot manipulator using mu...

引用

第36届中国控制会议

作者： Yilin Mi Feng Xu Junbo Tan Xueqian Wang Bin Liang Shenzhen Engineering Laboratory of Geometry Measurement Technology Graduate School at ShenzhenTsinghua University

ISBN: (纸本)9781538629185

In this paper,a fault-tolerant multi-sensor switching strategy is used for sensor-fault tolerance of robot manipulator with redundant sensors in each joint to provide the angular position of the *** strategy employs a linear-parameter-varying（LPV） model to describe the nonlinear dynamics of the robot ***,based on the obtained LPV model,a zonotopic set-based robust fault detection（FD） mechanism is further designed to monitor the system *** each time instant,the FD mechanism checks whether there are some sensors that have become faulty to make FD decisions.A switching controller is designed to choose the best estimation among the healthy sensors to generate closed-loop control *** a sensor has become faulty and is detected by the FD mechanism,the fault-tolerant strategy discards the faulty sensor and uses the healthy one to implement closed-loop *** the end,some simulation results are presented to illustrate the effectiveness of the proposed fault-tolerant control（FTC） strategy.

关键词： robot manipulator fault-tolerant control multi-sensor switching scheme bounded sets zonotopes

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Chiral Metal-Free Anti-Perovskite with Strong Chiroptical Nonlinearity

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Angewandte Chemie 2024年第6期137卷

作者： Zhaoyu Wang Xin Qiu Hebin Wang Wenkai Zhao Sehrish Gull Haolin Lu Zechen Hao Bing Sun Xin Zeng Prof. Xinfeng Liu Hao-Li Zhang Prof. Yongsheng Chen Prof. Tingchao He Prof. Guankui Long School of Materials Science and Engineering Tianjin Key Lab for Rare Earth Materials and Applications Smart Sensing Interdisciplinary Science Center Renewable Energy Conversion and Storage Center (RECAST) National Institute for Advanced Materials Nankai University Tianjin 300350 China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China State Key Laboratory of Applied Organic Chemistry (SKLAOC) Key Laboratory of Special Function Materials and Structure Design (MOE) College of Chemistry and Chemical Engineering Lanzhou University Lanzhou 730000 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing 100190 China The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer Chemistry Renewable Energy Conversion and Storage Center (RECAST) College of Chemistry Nankai University Tianjin 300071 China

The nonlinear chiroptical properties of chiral metal halide perovskite has attracted substantial attention in recent years. In order to overcome the inherent limitations of metal halide, such as high costs, potential toxicity, challenges with recycling, especially the limited laser-induced damage threshold (LDT), we have successfully constructed the first chiral metal-free anti-perovskite, with the aim of utilizing it in second harmonic generation-circular dichroism (SHG-CD). Moreover, the anti-perovskite composed entirely of small organic ions typically display a more extensive transparent window, which could contribute a high LDT. Herein two chiral metal-free anti-perovskites, R / S -MCN [( R / S -MBA) 6 Cl(NH 4 Cl 6 )] were constructed, and exhibit strong second-harmonic generation response from 800 to 980 nm. The second-order nonlinear optical coefficient of the chiral metal-free anti-perovskite reaches 0.89 pm/V, which is higher than that of commercial Y-cut quartz. Most importantly, both R - and S -MCN exhibit a large nonlinear optical activity with a high SHG dissymmetry factor ( g SHG-CD ) of 0.60 and a high laser-induced damage threshold of 71 mJ/cm 2 , which is higher than that of most reported chiral perovskites. Our findings indicate that chiral metal-free anti-perovskite have the potential to be a valuable addition to the development of next-generation nonlinear chiroptical devices.

关键词： Chiral Anti-Perovskite Metal-Free Material Second-Harmonic Generation Laser-Induced Damage Threshold Nonlinear Chiroptics

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Topological surface states in γ-PtBi2 evidenced by scanning tunneling microscopy

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Science Bulletin 2025年

作者： Guo, Yunkai Yan, Jingming Dong, Wen-Han Li, Yongkai Peng, Yucong Di, Xuetao Li, Caizhen Wang, Zhiwei Xu, Yong Tang, Peizhe Yao, Yugui Duan, Wenhui Xue, Qi-Kun Li, Wei State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China International Center for Quantum Materials Beijing Institute of Technology Zhuhai519000 China School of Materials Science and Engineering Beihang University Beijing100191 China Beijing Academy of Quantum Information Sciences Beijing100193 China Southern University of Science and Technology Shenzhen518055 China Hefei National Laboratory Hefei230088 China

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UPdec-Webb: A Dataset for Coaddition of JWST NIRCam Images

arXiv

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arXiv 2024年

作者： Wang, Lei Shan, Huanyuan Nie, Lin Cheng, Cheng Yuan, Fang-Ting Cui, Qifan Li, Guoliang Xie, Yushan Liu, Dezi Liu, Yao Fang, Min Li, Nan Jia, Peng Li, Ran Liu, Fengshan Shu, Yiping Jiang, Chang Wei, Cheng-Liang Qu, Han Zheng, Wen-Wen Zhu, Li-Yan Kang, Xi Purple Mountain Observatory Key Laboratory of Radio Astronomy Chinese Academy of Sciences 10 Yuanhua Road Qixia District Nanjing210023 China Shanghai Astronomical Observatory Chinese Academy of Sciences 80 Nandan Road Shanghai200030 China Key Laboratory of Radio Astronomy and Technology Chinese Academy of Sciences A20 Datun Road Chaoyang District Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Department of Information Engineering Wuhan Institute of City Hubei Wuhan430083 China Chinese Academy of Sciences South America Center for Astronomy National Astronomical Observatories CAS Beijing100101 China CAS Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Key Laboratory of Space and Technology National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China South-Western Institute for Astronomy Research Yunnan University Yunnan Kunming650500 China National Astronomical Observatories Chinese Academy of Sciences Beijing100871 China College of Electronic Information and Optical Engineering Taiyuan030024 China Peng Cheng Lab Shenzhen518066 China Department of Physics Durham University DurhamDH1 3LE United Kingdom Zhejiang Provincial Key Laboratory of Quantum Precision Measurement College of Science Institute for Frontiers and Interdisciplinary Sciences Zhejiang University of Technology 288 Liuhe Road Hangzhou310023 China Zhejiang University Purple Mountain Observatory Joint Research Center for Astronomy Zhejiang University Hangzhou327 China

We present the application of the image coaddition algorithm, Up-sampling and PSF Deconvolution Coaddition (UPDC), for stacking multiple exposure images captured by the James Webb Space Telescope (JWST) Near-Infrared Camera (NIRCam). By addressing the point spread function (PSF) effect, UPDC provides visually enhanced and sharper images. Furthermore, the anti-aliasing and super-resolution capabilities of UPDC make it easier to deblend sources overlapped on images, yielding a higher accuracy of aperture photometry. We apply this algorithm to the SMACS J0723 imaging data. Comparative analysis with the Drizzle algorithm demonstrates significant improvements in detecting faint sources, achieving accurate photometry, and effectively deblending (super-resolution) closely packed sources. As a result, we have newly detected a pair of close binary stars that were previously unresolvable in the original exposures or the Drizzled image. These improvements significantly benefit various scientific projects conducted by JWST. The resulting dataset, named"UPdec-Webb", can be accessible through the official website of the Chinese Virtual Observatory (ChinaVO). © 2024, CC BY-NC-SA.

关键词： Space telescopes

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