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arXiv 2024年

作者： Li, Xiao-Ping Cui, Chaoxi Wang, Lei Wu, Weikang Zhang, Zeying Yu, Zhi-Ming Yao, Yugui School of Physical Science and Technology Inner Mongolia University Hohhot010021 China School of Physics Beijing Institute of Technology Beijing100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China

According to the theory of group representations, the types of band degeneracy can be divided into accidental degeneracy and essential degeneracy. The essentially degenerate nodal lines (NLs) are typically resided on the high-symmetry lines of the Brillouin zone. Here, we propose a type of NL in two dimension that is essentially degenerate but is hidden within the high-symmetry planes, making it less observable, dubbed a hidden-essential nodal line (HENL). The existence of HENL is guaranteed as long as the system hosts a horizontal glide-mirror symmetry, hence such NLs can be widely found in both non-magnetic and magnetic systems. We perform an exhaustive search over all 528 magnetic layer groups (MLGs) for HENL that can be enforced by glide-mirror symmetry with both spinless and spinfull systems. We find that 122 candidate MLGs host spinless HENL, while 63 candidate MLGs demonstrate spinful HENL. In addition, we reveal that horizontal mirror and time-reversal symmetry in type-II and type-IV MLGs with spin-orbital coupling can enforce HENL formed. The 15 corresponding candidate MLGs have also been presented. Furthemore, we derive a few typical lattice models to characterize the existence for the HENL. For specific electronic fillings in real materials, namely 4N+2 in spinless systems (and 2N+1 in spinful systems), the presence of the HENLs in candidate MLGs is required regardless of the details of the systems. Using ab-initio calculations, we further identify possible material candidates that realize spinless and spinful HENL. Moreover, spinful HENLs exhibit a novel persistent spin texture wih the characteristic of momentum-independent spin configuration. Our findings uncover a new type of topological semimetal state and offer an ideal platform to study the related physics of HENLs. Copyright © 2024, The Authors. All rights reserved.

关键词： Mirrors

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Synchronization of Pulsating Optical Soliton Molecules

Synchronization of Pulsating Optical Soliton Molecules

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Grelu, Philippe Song, Youjian Zou, Defeng Gat, Omri Coillet, Aurélien Wang, Zhiqiang Laboratoire ICB UMR 6303 CNRS Université de Bourgogne 9 avenue A. Savory Dijon21000 France Key Laboratory of Opto-electromc Information Science and Technology of Ministry of Education Tianjin University Tianjin300072 China Racah Institute of Physics Hebrew University of Jerusalem Jerusalem91904 Israel Advanced Photonic Technology Lab Nanjing University of Posts and Telecommunications Nanjing210023 China

We experimentally demonstrate the synchronization of regularly vibrating soliton molecules by means of an injected modulated signal We also unveil the existence of chaotic intramolecular vibrations, to which we succes... 详细信息

ISBN: (纸本)9781957171258

关键词： Molecules

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Reciprocating Magnetic Fields in the Pulsar Wind Observed from the Black Widow Pulsar J1720-0534

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Research in Astronomy and Astrophysics 2023年第10期23卷 255-266页

作者： Chen-Chen Miao Victoria Blackmon Wei-Wei Zhu Dong-Zi Li Ming-Yu Ge Xiao-Peng You Maura McLaughlin Di Li Na Wang Pei Wang Jia-Rui Niu M.Cruces Jian-Ping Yuan Jun-Tao Bai D.J.Champion Yu-Tong Chen Ming-Min Chi P.C.C.Freire Yi Feng Zhen-Ye Gan M.Kramer Fei-Fei Kou Yu-Xi Li Xue-Li Miao Ling-Qi Meng Chen-Hui Niu Sheng-Nan Sun Zhong-Yi Sun H.M.Tedila Shuang-Qiang Wang Qing-Dong Wu Jing-Bo Wang Zhi-Gang Wen Shen Wang Ya-Biao Wang Cheng-Jie Wang Meng-Yao Xue You-Ling Yue Mao Yuan Ju-Mei Yao Wen-Ming Yan Ru-Shuang Zhao Lei Zhang De Zhao National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China West Virginia University 1500 University AveMorgantownWV 26506USA Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Cahill Center for Astronomy and Astrophysics California Institute of Technology1216 E California BoulevardPasadenaCA 91125USA Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physical Science and Technology Southwest UniversityChongqing 400715China Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Max-Planck Institut für Radioastronomie Auf dem Hügel 69D-53121 BonnGermany School of Computer Science Fudan UniversityShanghai 200433China Tencent Youtu Lab Shanghai 200233China College of Physical Science and Technology Central China Normal UniversityWuhan 430079China Institute of Optoelectronic Technology Lishui UniversityLishui 323000China Guizhou Normal University Guiyang 550001China

We report the radio observations of the eclipsing black widow pulsar J1720-0534, a 3.26 ms pulsar in orbit with a low mass companion of mass 0.029 to 0.034 M⊙. We obtain the phase-connected timing ephemeris and polarization profile of this millisecond pulsar(MSP) using the Five-hundred-meter Aperture Spherical radio Telescope(FAST), the Green Bank Telescope(GBT), and the Parkes Telescope. For the first time from such a system, an oscillatory polarization angle change was observed from a particular eclipse egress with partial depolarization, indicating 10-milliGauss-level reciprocating magnetic fields oscillating in a length scale of 5 ×10^(3)km(assuming an orbital inclination angle of 90°) outside the companion's magnetosphere. The dispersion measure variation observed during the ingresses and egresses shows the rapid raising of the electron density in the shock boundary between the companion's magnetosphere and the surrounding pulsar wind. We suggest that the observed oscillatory magnetic fields originate from the pulsar wind outside the companion's magnetosphere.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(J1720-0534) (stars:)binaries:eclipsing

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Superconductivity in subnanometer Mo6S6 nanowires

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Physical Review B 2025年第19期111卷 195401-195401页

作者： Yue Liu Tian Cui Da Li School of Materials Science and Engineering Changchun University of Science and Technology Changchun 130022 People's Republic of China State Key Lab of Superhard Materials and Key Laboratory of Material Simulation Methods & Software of Ministry of Education College of Physics Jilin University Changchun 130012 People's Republic of China School of Physical Science and Technology Ningbo University Ningbo 315211 People's Republic of China

One-dimensional (1D) superconducting nanowires hold potential for advanced applications in quantum computing, single-photon detection, nanoscale electronic devices, and precision sensing technologies. While several 1D superconducting nanowires have been reported, the superconductivity of transition metal chalcogenide nanowires remains unexplored. Here, we use an experimentally synthesized 1D Mo6S6 nanowire as a model to investigate the superconductivity of this nanowire. Our results reveal that a 1D Mo6S6 nanowire with a diameter of around 5Å exhibits unexpected partially flat-band superconductivity with a superconducting transition temperature (Tc) of 3.6 K. The gradual weakening of the d−d orbital electron hopping between adjacent Mo atoms within the Mo6 octahedral cage under tensile strain increases the density of states at the Fermi level, significantly enhancing electron-phonon coupling. Notably, under 5% tensile strain, the Tc of the 1D Mo6S6 nanowire increases to 13.6 K, accompanied by noticeable softening of the acoustic branches. These findings open different avenues for exploring the superconductivity of 1D transition metal chalcogenide nanowires and have broad implications for advancing 1D superconductors.

关键词： Nanowires

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Simulation for enhancement in sensitivity of chalcogenide glasses-based fibre optic evanescent absorption sensor for malignant tissue detection

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Micro and Nanosystems 2021年第2期13卷 180-185页

作者： Singh, Ritesh Kumar Mishra, Adarsh Chandra Lohia, Pooja Dwivedi, Dheerendra Kumar Department of Electronics and Communication Engineering Madan Mohan Malaviya University of Technology Gorakhpur U.P273010 India Amorphous Semiconductor Research Lab Department of Physics and Material Science Madan Mohan Malaviya University of Technology Gorakhpur U.P273010 India

Background: Refractive index determination of biological tissues is a challenging issue. Many biological species also show vibrational signature in the infrared domain. The chalcogenide-based glasses can be used to make the fibree optic evanescent wave sensors for the detection of the analyte. Objectives: The primary objective is to study the effect of various parameters on the sensitivity of chalcogenide glass-based evanescent-wave sensor for biological tissue detection. Methods: An evanescent wave sensor has been proposed with collimated source illumination and uniform tapering. The chalcogenide materials are chosen such that the weakly guiding approximation could be followed. Complex refractive indices of liver tissue samples have been taken for the analysis of sensitivity via the method of the evanescent absorption coefficient. Equations for sensitivity have been solved analytically using MATlab software. Results: The simplification of the formula for sensitivity leads to the inference that the sensitivity is a function of core radius, refractive indices of sample tissues and wavelength used. Moreover, since the refractive indices of the materials are also a function of temperature, therefore a change in temperature results in a change in the profile of guiding mode. Hence, the effect of temperature must also be ob-served. The initial simulation parameters are taken;core radius 100 µm, sensing length 4 cm and wavelength 1.0 µm. In the NIR region, we have a better sensitivity of detection for all the tissue samples and the risk of photodamage of the bio-samples is reduced to a good extent. It has been found that sensitivity decreases with wavelength and core radius, whereas increases with temperature. It has also been shown that sensitivity is found to be better with collimated in comparison with the diffused source. Conclusion: The comparative study results that one should operate at a shorter NIR region of wavelength for higher sensitivity. The collimated sourc

关键词： Refractive index

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Flat bands and distinct density wave orders in correlated Kagome superconductor CsCr3Sb5

arXiv

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arXiv 2024年

作者： Peng, Shuting Han, Yulei Li, Yongkai Shen, Jianchang Miao, Yu Luo, Yang Huai, Linwei Ou, Zhipeng Li, Hongyu Xiang, Ziji Liu, Zhengtai Shen, Dawei Hashimoto, Makoto Lu, Donghui Yao, Yugui Qiao, Zhenhua Wang, Zhiwei He, Junfeng Department of Physics CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of China Anhui Hefei230026 China Department of Physics Fuzhou University Fujian Fuzhou350108 China School of Physics Beijing Institute of Technology Beijing100081 China BeijingKey Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing100081 China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201210 China National Synchrotron Radiation Laboratory School of Nuclear Science and Technology University of Science and Technology of China Hefei230026 China Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314011 China

Kagome metal CsV3Sb5 has attracted much recent attention due to the coexistence of multiple exotic orders and the associated proposals to mimic unconventional high temperature superconductors. Nevertheless, magnetism and strong electronic correlations - two essential ingredients for unconventional superconductivity, are absent in this V-based Kagome metal. CsCr3Sb5 is a newly discovered Cr-based parallel of CsV3Sb5, in which magnetism appears with charge density wave and superconductivity at different temperature and pressure regions. Enhanced electronic correlations are also suggested by theoretical proposals due to the calculated flat bands. Here, we report angle-resolved photoemission measurements and first-principles calculations on this new material system. Electron energy bands and the associated orbitals are resolved. Flat bands are observed near the Fermi level. Doping dependent measurements on Cs(CrxV1-x)3Sb5 reveal a gradually enhanced band renormalization from CsV3Sb5 to CsCr3Sb5, accompanied by distinct spatial symmetry breaking states in the phase diagram. Copyright © 2024, The Authors. All rights reserved.

关键词： Charge density

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Depolymerization of lignin over heterogeneous Co-NC catalyst

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Journal of Environmental sciences 2025年第6期152卷 654-663页

作者： Fei Song Kai Du Huamei Yang Qi Luo Yuxuan Liu Qian Qiang Yangming Ding Qingda An Changzhi Li Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefinerySchool of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Yulin Key Laboratory of Resource Utilization of Coal Chemical Waste Shaanxi Key Laboratory of Low Metamorphic Coal Clean UtilizationSchool of Chemistry and Chemical EngineeringYulin UniversityYulin719000China University of Chinese Academy of Sciences Beijing 100049China

Green and atom-economic depolymerization of lignin remains a great challenge due toits complex non-repetitive structure and the inert property for chemo-digestion. A redoxneutrallignin depolymerization system without the use of extra oxidant and/or reductantover a Co-NC catalyst has been developed in this work, providing the first non-noble metalheterogeneous catalytic system for redox-neutral valorization of lignin. Mechanistic studiesbased on control reactions and deuterium labeling experiments suggest that the reactionproceeds via ametal-catalyzed dehydrogenation of C_(α)-OH to afford a carbonyl intermediate,followed by C_(β)-O bond cleavage (via hydrogenolysis) to afford monophenols and aromaticketone products. The hydrogen used for the cleavage of the C_(β)-O bond originates from thealcoholmoiety in the substrate, and the cascade dehydrogenation and hydrogenolysis stepsare highly coupled, rendering it an efficient and atom-economic process.

关键词： Lignin β-O-4 model compounds Depolymerization Co-NC Mild conditions Aromatic chemical

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Machine Learning With Data Assimilation and Uncertainty Quantification for Dynamical Systems:A Review

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IEEE/CAA Journal of Automatica Sinica 2023年第6期10卷 1361-1387页

作者： Sibo Cheng César Quilodrán-Casas Said Ouala Alban Farchi Che Liu Pierre Tandeo Ronan Fablet Didier Lucor Bertrand Iooss Julien Brajard Dunhui Xiao Tijana Janjic Weiping Ding Yike Guo Alberto Carrassi Marc Bocquet Rossella Arcucci Data Science Institute Department of ComputingImperial College LondonSW72AZ London Department of Earth Science and Engineering Imperial College LondonSW72AZ London Department of Computer Science and Engineering Hong Kong University of Science and TechnologyHong Kong 999077China the IMT Atlantique Lab-STICCUMR CNRS 6285France and OdysseyInria/IMTFrance.P.Tandeo is also with RIKEN Center for Computational ScienceKobeJapan the CEREA École des Ponts and EDF R&Dîle-de-FranceFrance the Laboratoire Interdisciplinaire des Sciences du Numérique CNRSParis-Saclay UniversityF-91403OrsayFrance the Electricitéde France(EDF) 78401 ChatouFranceInstitut de Mathématiques de Toulouse31062 ToulouseFrance and SINCLAIR AI LabSaclayFrance the Sorbonne University ParisFranceand also with Nansen Environmental and Remote Sensing Center(NERSC)BergenNorway the School of Mathematical Sciences Tongji UniversityShanghai 200092China the Mathematical Institute for Machine Learning and Data Science KU Eichstaett-IngolstadtBavariaGermany the School of Information Science and Technology Nantong UniversityNantong 226019China the Department of Physics and Astronomy“Augusto Righi” University of Bologna40124 BolognaItaly

Data assimilation(DA)and uncertainty quantification(UQ)are extensively used in analysing and reducing error propagation in high-dimensional spatial-temporal *** applications span from computational fluid dynamics(CFD)to geoscience and climate ***,much effort has been given in combining DA,UQ and machine learning(ML)*** research efforts seek to address some critical challenges in high-dimensional dynamical systems,including but not limited to dynamical system identification,reduced order surrogate modelling,error covariance specification and model error correction.A large number of developed techniques and methodologies exhibit a broad applicability across numerous domains,resulting in the necessity for a comprehensive *** paper provides the first overview of state-of-the-art researches in this interdisciplinary field,covering a wide range of *** review is aimed at ML scientists who attempt to apply DA and UQ techniques to improve the accuracy and the interpretability of their models,but also at DA and UQ experts who intend to integrate cutting-edge ML approaches to their ***,this article has a special focus on how ML methods can overcome the existing limits of DA and UQ,and vice *** exciting perspectives of this rapidly developing research field are also *** Terms-Data assimilation(DA),deep learning,machine learning(ML),reduced-order-modelling,uncertainty quantification(UQ).

关键词： assimilation overcome apply

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Superfast and sub-wavelength orbital rotation of plasmonic particles in focused Gaussian beams

arXiv

引用

arXiv 2023年

作者： Zhou, Lei-Ming Zhu, Xiaoyu Zheng, Yu Wang, Long Huang, Chan Jiang, Xiaoyun Shi, Yuzhi Sun, Fang-Wen Hu, Jigang Department of Optical Engineering School of Physics Hefei University of Technology Anhui Hefei230601 China CAS Key Lab of Quantum Information University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Institute of Precision Optical Engineering School of Physics Science and Engineering Tongji University Shanghai200092 China

The use of nanophotonics for optical manipulation has continuously attracted interest in both fundamental research and practical applications, due to its significantly enhanced capabilities at the nanoscale. In this work, we showed that plasmonic particles can be trapped at off-axis location in Gaussian beams assisted by surface plasmon resonance. The off-axis displacement can be tuned at the sub-wavelength scale by the incident light beams. Based on these, we propose that a superfast orbital rotation of particles in continuous-wave laser beam can be realized in tightly focused circularly polarized Gaussian beams. The rotation has a tunable orbital radius at the sub-wavelength scale and a superfast rotation speed (more than 104 r/s in water under common laboratory conditions). Our work will aid in the development of optically driven nanomachines, and find applications in micro/nano-rheology, micro-fluid mechanics, and biological research at the nanoscale. Copyright © 2023, The Authors. All rights reserved.

关键词： Gaussian beams

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Coordination-Induced Amidated Modified Polyacrylonitrile Loaded Ultrafine Palladium Nanoparticles for Thermocatalytic Hydrogen Evolution

SSRN

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SSRN 2024年

作者： Zhang, Qiaoyi Cai, Hongtan Liu, Xin Li, Yulin Wang, Meiyan Gao, Ge Meng, Zeshuo Sun, Haoteng Hao, Xiufeng School of Chemistry Jilin University Changchun130012 China Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China Department of Physics Rutgers University NewarkNJ07102 United States School of Nano Technology and Nano Bionics University of Science and Technology of China Hefei230026 China I-Lab Nano-X Vacuum Interconnected Workstation Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou215123 China Department of Chemistry Brown University RI02912 United States

A promising approach for powering hydrogen fuel cells (HFCs) involves the in-situ production of hydrogen from formic acid decomposition, with Pd-based catalysts recognized as effective for formic acid dehydrogenation. However, the immobilization of ultrafine palladium nanoparticles (Pd NPs) on catalytic supports presents a challenge and necessitates further investigation into their formation mechanism. We propose a coordination-induced strategy to understand the behavior of ultrafine Pd NPs formation based on multi-functional groups. To establish the structure-activity relationship for tunable Pd microenvironment and catalytic performance, we synthesized various polyacrylonitrile (PAN) carriers through hydrolysis and amidation modification. Molecular dynamics simulations confirmed that a stronger coordination-induced microenvironment facilitates the dispersion of Pd2+, suppressing aggregation and enhancing Pd loading. Our experimental results and density functional theory (DFT) calculations demonstrated that Pd@APAN(15_1%) with ultrafine Pd NPs (1.5 nm) exhibits higher catalytic activity, with Pd-imine and pdsecondary amine moieties contributing to the creation of a favorable catalysis microenvironment. This study provides new insights into the formation of ultrafine nanoparticles through coordination induction conducted by the introduction of common functional groups. © 2024, The Authors. All rights reserved.

关键词： Formic acid

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