Composite Weyl loops in magnetic topological semimetals

ORAL

Abstract

The discovery of magnetic Weyl semimetals has propelled the investigation of electronic topology in correlated systems. Many topological correlated and magnetic materials exhibit complex electronic structures at the Fermi level, which are essential in driving anomalous response and exhibit rich interplay with correlated order parameters. However, systematic characterization of the complete topological properties near the Fermi level in complex semimetals remains limited. Here I disentangle the rich topological structure of Co2MnGa through bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy combined with ab initio calculations [1,2]. I experimentally examine the system on multiple cleaving planes and identify three distinct families of Weyl loops, demonstrating a rich composite Weyl loop structure at the Fermi level. I discuss the implications of our findings for exotic transport in Co2MnGa and related magnetic Weyl systems [3,4].

**Work at Princeton was supported by the US DOE under the Basic Energy Sciences programme (Grant #: DOE/BES DE-FG-02-05ER46200) and by the Gordon and Betty Moore Foundation (GBMF4547 and GBMF9461; M.Z.H.)

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Publication: [1] Belopolski et al. Science 365, 6459 (2019).
[2] Hasan, Chang, Belopolski et al. Nat. Rev. Mat. 6, 784 (2021).
[3] Belopolski et al. arXiv:2005.02400.
[4] Belopolski et al. arXiv:2105.14034.

Presenters

  • Ilya Belopolski

    • RIKEN
    • Princeton University

Authors

  • Ilya Belopolski

    • RIKEN
    • Princeton University

  • Tyler A Cochran

    • Princeton University

  • Zijia Cheng

    • Princeton University
    • Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey, USA.

  • Xian Yang

    • Princeton University

  • Jia-Xin Yin

    • Princeton University
    • Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey, USA.

  • Guoqing Chang

    • Nanyang Technological University
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University

  • Kaustuv Manna

    • Max Planck Institute for Chemical Physics of Solids

  • Claudia Felser

    • Max Planck Institute for Chemical Physic
    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Max Planck Institute for Chemical Physics of Solids

  • Zahid M Hasan

    • Princeton University
    • Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7), Department of Physics, Princeton University, Princeton, New Jersey, USA.