Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)

doi:10.1103/PhysRevX.13.011046

	Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)
	Lin, Y.S.1; Wang, S.Y.1; Zhang, X.2 ; Feng, Y.1; Pan, Y.P.1; Ru, H.1; Zhu, J.J.1; Xiang, B.K.1; Liu, K.1; Zheng, C.L.1; Wei, L.Y.2 ; Wang, M.X.2,3 ; Liu, Z.K.2,3 ; Chen, L.4; Jiang, K.5; Guo, Y.F.2 ; Wang, Ziqiang 6; Wang, Y.H.1,7
	2023-01
发表期刊	PHYSICAL REVIEW X
EISSN	2160-3308
卷号	13 期号:1
DOI	10.1103/PhysRevX.13.011046
摘要	Vortices are topological defects of type-II superconductors in an external magnetic field. In a similar fashion to a quantum anomalous Hall insulator, quantum anomalous vortices (QAV) spontaneously nucleate due to orbital-and-spin exchange interaction between supercurrent and magnetic impurity moment without an external magnetic field. Here, we used scanning superconducting quantum interference device microscopy (sSQUID) to search for its signatures in iron-chalcogenide superconductor Fe(Se,Te). Under zero magnetic field, we found a stochastic distribution of isolated anomalous vortices and antivortices with flux quanta φ0. By applying a small local magnetic field under the coil of the nano-SQUID device, we observed hysteretic flipping of the vortices reminiscent of the switching of ferromagnetic domains, suggesting locally broken time-reversal symmetry. We further observed vectorial rotation of a flux line linking a vortex-antivortex pair by manipulating the local field. These unique properties of the anomalous vortices satisfy the defining criteria of QAV. Our observation suggests an emergent quantum phase with spontaneously nucleated vortex-antivortex matter in an iron-based superconductor with nontrivial topological band structure. © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
关键词	Magnetic fields SQUIDs Stochastic systems Superconducting materials Topology Antivortex Direct observations External magnetic field Iron chalcogenides Magnetic impurity Orbitals Spin-exchange interaction Supercurrents Topological defect Type II superconductors
URL	查看原文
收录类别	EI
语种	英语
出版者	American Physical Society
EI入藏号	20231413844583
EI主题词	Vortex flow
EI分类号	631.1 Fluid Flow, General ; 701.2 Magnetism: Basic Concepts and Phenomena ; 708.3 Superconducting Materials ; 731.1 Control Systems ; 921.4 Combinatorial Mathematics, Includes Graph Theory, Set Theory ; 961 Systems Science
原始文献类型	Journal article (JA)
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/290026
专题	物质科学与技术学院物质科学与技术学院_PI研究组_柳仲楷组物质科学与技术学院_PI研究组_郭艳峰组物质科学与技术学院_硕士生物质科学与技术学院_本科生物质科学与技术学院_博士生
通讯作者	Wang, Y.H.
作者单位	1.State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai; 200433, China; 2.School of Physical Science and Technology, ShanghaiTech University, Shanghai; 201210, China; 3.ShanghaiTech Laboratory for Topological Physics, Shanghai; 201210, China; 4.Shanghai Institute of Microsystem and Information Technology, Shanghai; 200050, China; 5.Institute of Physics, Chinese Academy of Sciences, Beijing; 100190, China; 6.Department of Physics, Boston College, Chestnut Hill; MA; 02138, United States; 7.Shanghai Research Center for Quantum Sciences, Shanghai; 201315, China
推荐引用方式 GB/T 7714	Lin, Y.S.,Wang, S.Y.,Zhang, X.,et al. Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)[J]. PHYSICAL REVIEW X,2023,13(1).
APA	Lin, Y.S..,Wang, S.Y..,Zhang, X..,Feng, Y..,Pan, Y.P..,...&Wang, Y.H..(2023).Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te).PHYSICAL REVIEW X,13(1).
MLA	Lin, Y.S.,et al."Direct Observation of Quantum Anomalous Vortex in Fe(Se,Te)".PHYSICAL REVIEW X 13.1(2023).