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Weyl spin-momentum locking in a chiral topological semimetal

Author

Listed:
  • Jonas A. Krieger

    (Max Planck Institut für Mikrostrukturphysik
    Paul Scherrer Institute)

  • Samuel Stolz

    (University of California
    Swiss Federal Laboratories for Materials Science and Technology)

  • Iñigo Robredo

    (Max Planck Institute for Chemical Physics of Solids
    Donostia International Physics Center)

  • Kaustuv Manna

    (Indian Institute of Technology-Delhi)

  • Emily C. McFarlane

    (Max Planck Institut für Mikrostrukturphysik)

  • Mihir Date

    (Max Planck Institut für Mikrostrukturphysik)

  • Banabir Pal

    (Max Planck Institut für Mikrostrukturphysik)

  • Jiabao Yang

    (Max Planck Institut für Mikrostrukturphysik)

  • Eduardo B. Guedes

    (Paul Scherrer Institute
    École Polytechnique Fédérale de Lausanne)

  • J. Hugo Dil

    (Paul Scherrer Institute
    École Polytechnique Fédérale de Lausanne)

  • Craig M. Polley

    (Lund University)

  • Mats Leandersson

    (Lund University)

  • Chandra Shekhar

    (Max Planck Institute for Chemical Physics of Solids)

  • Horst Borrmann

    (Max Planck Institute for Chemical Physics of Solids)

  • Qun Yang

    (Max Planck Institute for Chemical Physics of Solids)

  • Mao Lin

    (University of Illinois)

  • Vladimir N. Strocov

    (Paul Scherrer Institute)

  • Marco Caputo

    (Paul Scherrer Institute)

  • Matthew D. Watson

    (Harwell Science and Innovation Campus)

  • Timur K. Kim

    (Harwell Science and Innovation Campus)

  • Cephise Cacho

    (Harwell Science and Innovation Campus)

  • Federico Mazzola

    (Consiglio Nazionale delle Ricerche
    Ca’ Foscari University of Venice)

  • Jun Fujii

    (Area Science Park)

  • Ivana Vobornik

    (Area Science Park)

  • Stuart S. P. Parkin

    (Max Planck Institut für Mikrostrukturphysik)

  • Barry Bradlyn

    (University of Illinois)

  • Claudia Felser

    (Max Planck Institute for Chemical Physics of Solids)

  • Maia G. Vergniory

    (Max Planck Institute for Chemical Physics of Solids
    Donostia International Physics Center)

  • Niels B. M. Schröter

    (Max Planck Institut für Mikrostrukturphysik)

Abstract

Spin-orbit coupling in noncentrosymmetric crystals leads to spin-momentum locking – a directional relationship between an electron’s spin angular momentum and its linear momentum. Isotropic orthogonal Rashba spin-momentum locking has been studied for decades, while its counterpart, isotropic parallel Weyl spin-momentum locking has remained elusive in experiments. Theory predicts that Weyl spin-momentum locking can only be realized in structurally chiral cubic crystals in the vicinity of Kramers-Weyl or multifold fermions. Here, we use spin- and angle-resolved photoemission spectroscopy to evidence Weyl spin-momentum locking of multifold fermions in the chiral topological semimetal PtGa. We find that the electron spin of the Fermi arc surface states is orthogonal to their Fermi surface contour for momenta close to the projection of the bulk multifold fermion at the Γ point, which is consistent with Weyl spin-momentum locking of the latter. The direct measurement of the bulk spin texture of the multifold fermion at the R point also displays Weyl spin-momentum locking. The discovery of Weyl spin-momentum locking may lead to energy-efficient memory devices and Josephson diodes based on chiral topological semimetals.

Suggested Citation

  • Jonas A. Krieger & Samuel Stolz & Iñigo Robredo & Kaustuv Manna & Emily C. McFarlane & Mihir Date & Banabir Pal & Jiabao Yang & Eduardo B. Guedes & J. Hugo Dil & Craig M. Polley & Mats Leandersson & C, 2024. "Weyl spin-momentum locking in a chiral topological semimetal," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
  • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47976-0
    DOI: 10.1038/s41467-024-47976-0
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    References listed on IDEAS

    as
    1. Zhicheng Rao & Hang Li & Tiantian Zhang & Shangjie Tian & Chenghe Li & Binbin Fu & Cenyao Tang & Le Wang & Zhilin Li & Wenhui Fan & Jiajun Li & Yaobo Huang & Zhehong Liu & Youwen Long & Chen Fang & Ho, 2019. "Observation of unconventional chiral fermions with long Fermi arcs in CoSi," Nature, Nature, vol. 567(7749), pages 496-499, March.
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    3. Tetsuya Furukawa & Yuri Shimokawa & Kaya Kobayashi & Tetsuaki Itou, 2017. "Observation of current-induced bulk magnetization in elemental tellurium," Nature Communications, Nature, vol. 8(1), pages 1-5, December.
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