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Signatures of a topological Weyl loop in magnetic semimetal Co3Sn2S2

ORAL

Abstract

The search for novel topological phases of matter in quantum magnets has emerged as a frontier of condensed matter physics. Here we present our high-resolution angle-resolved photoemission spectroscopy results on single crystals of Co3Sn2S2 in its ferromagnetic phase. We report for the first time signatures of a topological Weyl loop. From fundamental symmetry considerations, this magnetic Weyl loop is expected to be gapless if the spin-orbit coupling(SOC) is strictly zero but gapped, with possible Weyl points, under finite SOC. We point out that high-resolution ARPES results to date cannot unambiguously resolve the SOC gap anywhere along the Weyl loop. As a result, we argue that from the point of view of photoemission spectroscopy the presence of Weyl points in Co3Sn2S2 remains ambiguous. We will also present our recent results on the tunability of the electronic structure in magnetic semimetal Co3Sn2S2.

[1] Belopolski Ilya et al. Signatures of a topological Weyl loop in Co3Sn2S2. arXiv preprint arXiv:2005.02400, (2020).

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Presenters

  • Zijia Cheng

    Princeton University, Department of Physics, Princeton University

Authors

  • Zijia Cheng

    Princeton University, Department of Physics, Princeton University

  • Ilya Belopolski

    Princeton University, Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Department of Physics, Princeton University, Center for Emergent Matter Science, RIKEN

  • Tyler Cochran

    Princeton University, Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Department of Physics, Princeton University

  • Stepan Tsirkin

    Department of Physics, University of Zurich, Department of Physics, University of Zurich (Switzerland), Univ of Zurich, Physics, University of Zurich

  • Jiaxin Yin

    Princeton University, Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Department of Physics, Princeton University

  • Songtian Zhang

    Princeton University, Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Department of Physics, Princeton University

  • Xiaoxiong Liu

    Department of Physics, University of Zurich, Physics, University of Zurich

  • Guoqing Chang

    Princeton University, Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University, Nanyang Technological University, Department of Physics, Princeton University

  • Xian Yang

    Princeton University, Department of Physics, Princeton University

  • Daniel Multer

    Princeton University, Department of Physics, Princeton University

  • Timur Kim

    Diamond Light Source, Diamond Light Source, UK

  • Cephise Cacho

    Diamond Light Source

  • Claudia Felser

    Max Planck Institute for Chemical Physics of Solids, Max Planck Institute for the Chemical Physics of Solids, Solid State Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Institute, Dresden, Germany, Max Planck, Dresden, Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Max Planck Institute for Chemical Physics of Solids,

  • Titus Neupert

    University of Zurich, Universität Zürich, Department of Physics, University of Zurich, Univ of Zurich, Physics, University of Zurich

  • Hasan Zahid

    Department of Physics, Princeton University