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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*Work at Princeton University and Princeton-led synchrotron-based ARPES measurements were supported by the United States Department of Energy (US DOE) under the Basic Energy Sciences program (grant number DOE/BES DE-FG-02-05ER46200).<gdiv></gdiv>
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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,
