Parallel spin-momentum locking in a chiral topological semimetal

ORAL

Abstract

We present experimental evidence for parallel spin-momentum locking of a multifold fermion in the chiral topological semimetal PtGa. While orthogonal spin-momentum locking, such as Rashba spin-orbit coupling has been studied for decades and inspired a vast number of applications, its natural counterpart, the purely parallel spin-momentum locking over a full Fermi surface, has so far remained elusive in experiments. Recently, chiral topological semimetals that host single- and multifold band crossings have been predicted to realize such parallel locking [1-4]. We use spin- and angle-resolved photoelectron spectroscopy to probe the spin-texture of the topological Fermi-arc surface states in PtGa and find that the spin points orthogonal to the Fermi surface contour for momenta close to the projection of the bulk multifold fermion, which is consistent with parallel spin-momentum locking of the latter [5].

[1] G. Chang, et al., Nat. Mater. 17, 978 (2018).

[2] C. Mera Acosta, et al., Phys. Rev. B 104, 104408 (2021)

[3] W. Tan, et al., Adv Funct Materials, 2208023 (2022).

[4] M. Lin, et. al, arxiv:2204.10113 [cond-mat] (2022).

[5] J. A. Krieger, et. al, arxiv: 2210.08221 [cond-mat] (2022)

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Publication: J. A. Krieger, et. al, arxiv: 2210.08221 [cond-mat] (2022); (submitted)

Presenters

  • Jonas A Krieger

    • Max Planck Institute of Microstructure Physics

Authors

  • Jonas A Krieger

    • Max Planck Institute of Microstructure Physics

  • Samuel Stolz

    • University of California, Berkeley

  • Iñigo Robredo

    • Max Planck Institute CPFS

  • Kaustuv Manna

    • Max Planck Institute for Chemical Physics of Solids

  • Emily C McFarlane

    • Max Planck Institute of Microstructure Physics

  • Mihir Date

    • Max Planck Institute of Microstructure Physics

  • Eduardo B Bonini-Guedes

    • Swiss Light Source, Paul Scherrer Insitute
    • Paul Scherrer Institut

  • J. Hugo Dil

    • Swiss Light Source, Paul Scherrer Insitute

  • Chandra Shekhar

    • Max Planck Institute for Chemical Physics of Solids

  • Qun Yang

    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solid

  • Mao Lin

    • Amazon Web Services
    • University of Illinois at Urbana-Champaign

  • Vladimir N Strocov

    • Swiss Light Source, Paul Scherrer Institut
    • Swiss Light Source, Paul Scherrer Insitute
    • Swiss Light Source
    • Paul Scherrer Institut

  • Banabir Pal

    • Max Planck Insitute of Microstructure Physics

  • Matthew D Watson

    • Diamond Light Source

  • Timur Kim

    • Diamond Light Source

  • Cephise Cacho

    • Diamond Light Source

  • Federico Mazzola

    • CNR-IOM, Trieste

  • Jun Fujii

    • CNR-IOM, Trieste
    • Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, Trieste, Italy

  • Ivana Vobornik

    • CNR-IOM, Trieste
    • Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, Trieste, Italy

  • Stuart Parkin

    • Max Planck Inst Microstructure
    • Max Planck Institute of Microstructure Physics
    • Max Planck Institute of Microstructure Physics, Halle 06120, Germany

  • Barry Bradlyn

    • University of Illinois at Urbana-Champai
    • University of Illinois at Urbana-Champaign

  • Claudia Felser

    • Max Planck Institute for Chemical Physic
    • Max Planck Institute for Chemical Physics of Solids

  • Maia Garcia Vergniory

    • Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
    • Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018 Donostia-San Sebastian, Spain
    • Donostia International Physics Center and Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute for Chemical Physics of Solids
    • Max Planck Institute CPFS
    • Donostia International Physics Center

  • Niels B Schröter

    • Max Planck Institute of Microstructure Physics
    • Paul Scherrer Institut