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No observation of chiral flux current in the topological kagome metal CsV3Sb5

Physical Review B 2022年第4期105卷 045102-045102页

作者： Huazhou Li Siyuan Wan Han Li Qing Li Qiangqiang Gu Huan Yang Yongkai Li Zhiwei Wang Yugui Yao Hai-Hu Wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China

Compounds with kagome lattice usually host many exotic quantum states, including the quantum spin liquid, non-trivial topological Dirac bands and a strongly renormalized flat band, etc. Recently an interesting vanadium based kagome family AV3Sb5 (A=K,Rb,orCs) was discovered, and these materials exhibit multiple interesting properties, including unconventional saddle-point driving charge density wave (CDW) state, superconductivity, etc. Furthermore, some experiments show the anomalous Hall effect which inspires us to believe that there might be some chiral flux current states. Here we report scanning tunneling measurements by using spin-polarized tips. Although we have observed clearly the 2a0×2a0 CDW and 4a0 stripe orders, the well-designed experiments with refined spin-polarized tips do not reveal any trace of the chiral flux current phase in CsV3Sb5 within the limits of experimental accuracy. No observation of the local magnetic moment in our experiments may put an upper bound constraint on the magnitude of magnetic moments induced by the possible chiral loop current which has a time-reversal symmetry breaking along c axis in CsV3Sb5.

关键词： Charge density waves Methods in superconductivity Superconductivity Kagome lattice Topological materials Scanning tunneling spectroscopy

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Quadrupolar topological behavior of elastic waves in nonsymmorphic two-dimensional square lattices

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Physical Review Applied 2025年第3期23卷 034034-034034页

作者： Yijie Liu Yuyang Chen Zhaoyang Guo Zhi-Kang Lin Di Zhou Feng Li Ying Wu School of Civil and Transportation Engineering Guangzhou University 230 Wai Huan Xi Road Guangzhou 510006 China School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215006 China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China

We investigate a higher-order topological behavior in elastic lattices characterized by nonsymmorphic symmetries. In the theoretical spring-mass lattice, altering the vertex mass allows for fine tuning of the topological features within the band gap. We analyze the quadrupole topological behavior in square lattices with nonsymmorphic symmetries using nested Wannier bands. Beyond second-order topological metamaterials, a single-phase topological configuration promotes energy localization at the corners due to a nonzero relative quadrupole moment. Our findings are validated through experimental observations of higher-order topological corner states, which show excellent agreement with simulated results and theoretical predictions. Additionally, the elastic lattices in the self-similar system exhibit fractal higher-order topological behaviors, revealing numerous topological edge and corner states. The self-similar lattice also demonstrates enhanced energy localization, with the number of topological states showing a linear correlation to the corner dimension. This study provides insights into elastic higher-order topological insulators and inspires innovative strategies for simulating topological elastic materials.

关键词： Topology

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Estimating many properties of a quantum state via quantum reservoir processing

arXiv

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arXiv 2023年

作者： Li, Yinfei Ghosh, Sanjib Shang, Jiangwei Xiong, Qihua Zhang, Xiangdong Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement Ministry of Education School of Physics Beijing Institute of Technology Beijing100081 China Beijing Academy of Quantum Information Sciences Beijing100193 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China

Estimating properties of a quantum state is an indispensable task in various applications of quantum information processing. To predict properties in the post-processing stage, it is inherent to first perceive the quantum state with a measurement protocol and store the information acquired. In this work, we propose a general framework for constructing classical approximations of arbitrary quantum states with quantum reservoirs. A key advantage of our method is that only a single local measurement setting is required for estimating arbitrary properties, while most of the previous methods need exponentially increasing number of measurement settings. To estimate M properties simultaneously, the size of the classical approximation scales as ln M. Moreover, this estimation scheme is extendable to higher-dimensional systems and hybrid systems with non-identical local dimensions, which makes it exceptionally generic. We support our theoretical findings with extensive numerical simulations. © 2023, CC BY.

关键词： Hybrid systems

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Emergent chiral toplogical point gaps in a non-Hermitian quasiperiodic Su-Schrieffer-Heeger model

arXiv

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arXiv 2025年

作者： Liang, Zhi-Bin Li, Shan-Zhong Li, Runze Li, Zhi Key Laboratory of Atomic and Subatomic Structure and Quantum Control Ministry of Education Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter School of Physics South China Normal University Guangzhou510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for Physics South China Normal University Guangzhou510006 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement MOE 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

We study a quasiperiodic Su-Schrieffer-Heeger lattice with staggered on-site gain-loss. The results reveal that on-site staggered gain-loss can effectively induce non-Hermitian topological gap without introducing imaginary phase. Further analysis exhibits that five different processes of topological phase transitions, including topological re-entrant phenomena, with the gain-loss intensity increasing. In addition, through the analysis of inverse participation ratios, normalized participation ratios, winding number and other indicators, we find that topological phase transitions occur synchronically with localized phase transitions. Finally, by investigating the properties of dual space eigenfunction, we reveal that the non-Hermitian topological point gaps predicted in this paper are chiral point gaps, which have a pair of skin modes along opposite directions simultaneously. Copyright © 2025, The Authors. All rights reserved.

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Weak electronic correlations in the kagome superconductor AV3Sb5 (A=K, Rb, Cs)

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Physical Review B 2022年第23期105卷 235130-235130页

作者： Min Liu Zhiwei Wang Jin-Jian Zhou Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems and School of Physics Beijing Institute of Technology Beijing 100081 People's Republic of China Material Science Center Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314011 People's Republic of China

The kagome metals AV3Sb5 (A=K, Rb, Cs) have recently received enormous attention as they exhibit nontrivial topological electronic structure, flat band, unconventional intertwined charge density wave (CDW), anomalous Hall effect, and superconductivity. However, it is still controversial whether or not electronic correlations play an important role in these novel phenomena. Here we perform an extensive investigation on AV3Sb5 (A=K, Rb, Cs) with density functional theory plus dynamical mean field theory calculations. Our results indicate the electronic correlations effects are in the weak regime in both the normal state and the CDW state. The value of effective mass-enhancement m*/mDFT is about 1.3, and it is barely changed at temperatures ranging 50–900 K in the normal state. Our static susceptibility calculations with the normal structure show that static susceptibility has a weak qz dependence and the Fermi-surface nesting mechanism does not work in this system. In the CDW state with the inverse Star of David structure, the spectral function opens a CDW gap at the Fermi level below TCDW (50 K) compared with the normal state above TCDW (300 K). We find that there exists orbital multiplicity at the Fermi level owing to two nonequivalent V atoms in CDW states, which may have an important role in forming the CDW order.

关键词： Charge density waves Electronic structure Fermi surface First-principles calculations Dynamical mean field theory

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Exceptional-Surface-Tailored Robust Microlaser

Exceptional-Surface-Tailored Robust Microlaser

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

作者： Liao, Kun Zhong, Yangguang Du, Zhuochen Liu, Guodong Li, Chentong Wu, Xianxin Deng, Chunhua Lu, Cuicui Wang, Xingyuan Chan, Che Ting Song, Qinghai Wang, Shufeng Liu, Xinfeng Hu, Xiaoyong Gong, Qihuang State Key Laboratory for Mesoscopic Physics Department of Physics Collaborative Innovation Center of Quantum Matter Beijing Academy of Quantum Information Sciences Nano-optoelectronics Frontier Center Ministry of Education Peking University Beijing100871 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China Shenzhen518055 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China Peking University Yangtze Delta Institute of Optoelectronics Jiangsu Nantong226010 China

We report a scalable strategy to realize a robust on-chip integrated microlaser source with simultaneous in-plane emission, linewidth compression, and pump energy utilization improvement based on different orders of e... 详细信息

ISBN: (纸本)9781957171395

关键词： Optical pumping

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Exceptional-Surface-Tailored Robust Microlaser

Exceptional-Surface-Tailored Robust Microlaser

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Liao, Kun Zhong, Yangguang Du, Zhuochen Liu, Guodong Li, Chentong Wu, Xianxin Deng, Chunhua Lu, Cuicui Wang, Xingyuan Chan, Che Ting Song, Qinghai Wang, Shufeng Liu, Xinfeng Hu, Xiaoyong Gong, Qihuang State Key Laboratory for Mesoscopic Physics Department of Physics Collaborative Innovation Center of Quantum Matter Beijing Academy of Quantum Information Sciences Nano-optoelectronics Frontier Center of Ministry of Education Peking University Beijing100871 China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing100190 China Shenzhen518055 China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing100081 China College of Mathematics and Physics Beijing University of Chemical Technology Beijing100029 China Department of Physics The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China Peking University Yangtze Delta Institute of Optoelectronics Jiangsu Nantong226010 China

关键词： Optical depth

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In-Plane Anomalous Hall Effect in PT-Symmetric Antiferromagnetic Materials

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Physical Review Letters 2023年第16期130卷 166702-166702页

作者： Jin Cao Wei Jiang Xiao-Ping Li Daifeng Tu Jiadong Zhou Jianhui Zhou Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory HFIPS Anhui Chinese Academy of Sciences Hefei 230031 P. R. China Department of Physics University of Science and Technology of China Hefei 230026 P. R. China

The anomalous Hall effect (AHE), a protocol of various low-power dissipation quantum phenomena and a fundamental precursor of intriguing topological phases of matter, is usually observed in ferromagnetic materials with an orthogonal configuration between the electric field, magnetization, and the Hall current. Here, based on the symmetry analysis, we find an unconventional AHE induced by the in-plane magnetic field (IPAHE) via the spin-canting effect in PT-symmetric antiferromagnetic (AFM) systems, featuring a linear dependence of magnetic field and 2π angle periodicity with a comparable magnitude to conventional AHE. We demonstrate the key findings in the known AFM Dirac semimetal CuMnAs and a new kind of AFM heterodimensional VS2−VS superlattice with a nodal-line Fermi surface and, also, briefly discuss the experimental detection. Our Letter provides an efficient pathway for searching and/or designing realistic materials for a novel IPAHE that could greatly facilitate their application in AFM spintronic devices. National Science Foundation

关键词： Antiferromagnetism Hall effect Transport phenomena First-principles calculations

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Giant magneto-optical Schäfer-Hubert effect in the two-dimensional van der Waals antiferromagnets MPS3 (M=Mn, Fe, Ni)

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Physical Review B 2023年第21期107卷 214437-214437页

作者： Ping Yang Wanxiang Feng Gui-Bin Liu Guang-Yu Guo Yugui Yao Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Department of Physics and Center for Theoretical Physics National Taiwan University Taipei 10617 Taiwan Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan

The recent discovery of long-range magnetic order in atomically thin films has triggered particular interest in two-dimensional (2D) van der Waals (vdW) magnetic materials. In this paper, we perform a systematic theoretical study of the magneto-optical Schäfer-Hubert effect (MOSHE) in 2D vdW antiferromagnetic MPS3 (M=Mn, Fe, Ni) with multifold intralayer and interlayer magnetic orders. The formula for evaluating the MOSHE in 2D magnets is derived by considering the influence of a nonmagnetic substrate. The MOSHE of monolayer and bilayer MPS3 is very large (>2∘), originating from the strong anisotropy of in-plane optical conductivity. The Schäfer-Hubert rotation angles are surprisingly insensitive to the orientations of the Néel vector, while the Schäfer-Hubert ellipticities are identified to be a good criterion to distinguish different interlayer magnetic orders. Our work establishes a theoretical framework for exploring novel 2D vdW magnets and facilitates the promising applications of the 2D MPS3 family in antiferromagnetic nanophotonic devices.

关键词： Magneto-optics Density functional calculations

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Encyclopedia of emergent particles in type-IV magnetic space groups

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Physical Review B 2022年第10期105卷 104426-104426页

作者： Zeying Zhang Gui-Bin Liu Zhi-Ming Yu Shengyuan A. Yang Yugui Yao College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics & Ultrafine Optoelectronic Systems School of Physics Beijing Institute of Technology Beijing 100081 China Research Laboratory for Quantum Materials Singapore University of Technology and Design Singapore 487372 Singapore

The research on emergent particles in condensed matters has been attracting tremendous interest, and recently it is extended to magnetic systems. Here, we study the emergent particles stabilized by the symmetries of type-IV magnetic space groups (MSGs) based on our classification of emergent particles in 230 gray space groups [Yu et al., Sci. Bull. 67, 375 (2022)]. Type-IV MSGs feature a special time reversal symmetry {T|t0}, namely, the time reversal operation followed by a half lattice translation, which significantly alters the symmetry conditions for stabilizing the band degeneracies. In this work, based on symmetry analysis and modeling, we present a complete classification of emergent particles in type-IV MSGs by studying all possible (spinless and spinful, essential and accidental) particles in each of the 517 type-IV MSGs. Particularly, the detailed correspondence between the emergent particles and the type-IV MSGs that can host them are given in easily accessed interactive tables, where the basic information of the emergent particles, including the symmetry conditions, the effective Hamiltonian, the band dispersion, and the topological characters, can be found. According to the established encyclopedia, we find that several emergent particles that are previously believed to exist only in spinless systems will occur in spinful systems here, and vice versa, due to the {T|t0} symmetry. Our work not only deepens the understanding of the symmetry conditions for realizing emergent particles but also provides specific guidance for searching and designing materials with target particles.

关键词： Magnetic order Topological materials Dirac semimetal Node-line semimetals Semimetals Weyl semimetal

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