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    Spontaneous Ferromagnetism Induced Topological Transition in EuB6

    W. L. Liu1,2,3,*,∥, X. Zhang2,*, S. M. Nie4,*, Z. T. Liu1,*, X. Y. Sun2, H. Y. Wang2, J. Y. Ding1,3, Q. Jiang1,3, L. Sun5 et al.

    F. H. Xue5, Z. Huang1, H. Su2, Y. C. Yang1, Z. C. Jiang1, X. L. Lu1,3, J. Yuan2, Soohyun Cho1, J. S. Liu1,3, Z. H. Liu1,3, M. Ye1,3, S. L. Zhang2, H. M. Weng6,7, Z. Liu2, Y. F. Guo2,†, Z. J. Wang6,7,‡, and D. W. Shen1,3,§

    • 1Center for Excellence in Superconducting Electronics, State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China
    • 2School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
    • 3Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
    • 4Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
    • 5School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China
    • 6Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
    • 7University of Chinese Academy of Sciences, Beijing 100049, China

    • *These authors contributed equally to this work.
    • †guoyf@shanghaitech.edu.cn
    • ‡wzj@iphy.ac.cn
    • §dwshen@mail.sim.ac.cn
    • ∥Present address: Institute of Advanced Science Facilities, Shenzhen, Guangdong, 518107, China.

    Phys. Rev. Lett. 129, 166402 – Published 13 October, 2022

    DOI: https://doi.org/10.1103/PhysRevLett.129.166402

    Abstract

    The interplay between various symmetries and electronic bands topology is one of the core issues for topological quantum materials. Spontaneous magnetism, which leads to the breaking of time-reversal symmetry, has been proven to be a powerful approach to trigger various exotic topological phases. In this Letter, utilizing the combination of angle-resolved photoemission spectroscopy, magneto-optical Kerr effect microscopy, and first-principles calculations, we present the direct evidence on the realization of the long-sought spontaneous ferromagnetism induced topological transition in soft ferromagnetic EuB6. Explicitly, we reveal the topological transition is from Z2=1 topological insulator in paramagnetic state to χ=1 magnetic topological semimetal in low temperature ferromagnetic state. Our results demonstrate that the simple band structure near the Fermi level and rich topological phases make EuB6 an ideal platform to study the topological phase physics.

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