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  • Krieger, Jonas A.Max Planck Institute of Microstructure Physics,Paul Scherrer Institute (author)

Weyl spin-momentum locking in a chiral topological semimetal

  • Article/chapterEnglish2024

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  • 2024

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  • LIBRIS-ID:oai:lup.lub.lu.se:a95daeb4-91d7-4e1c-a6ae-b024cf136b1b
  • https://lup.lub.lu.se/record/a95daeb4-91d7-4e1c-a6ae-b024cf136b1bURI
  • https://doi.org/10.1038/s41467-024-47976-0DOI

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  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • 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.

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  • Stolz, SamuelUniversity of California, Berkeley,Swiss Federal Laboratories for Materials Science and Technology (author)
  • Robredo, IñigoDonostia International Physics Center (DIPC),Max Planck Institute for Chemical Physics of Solids (author)
  • Manna, KaustuvIndian Institute of Technology (author)
  • McFarlane, Emily C.Max Planck Institute of Microstructure Physics (author)
  • Date, MihirMax Planck Institute of Microstructure Physics (author)
  • Pal, BanabirMax Planck Institute of Microstructure Physics (author)
  • Yang, JiabaoMax Planck Institute of Microstructure Physics (author)
  • B. Guedes, EduardoSwiss Federal Institute of Technology,Paul Scherrer Institute (author)
  • Dil, J. HugoPaul Scherrer Institute,Swiss Federal Institute of Technology (author)
  • Polley, Craig M.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)cr4837po (author)
  • Leandersson, MatsLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-mle (author)
  • Shekhar, ChandraMax Planck Institute for Chemical Physics of Solids (author)
  • Borrmann, HorstMax Planck Institute for Chemical Physics of Solids (author)
  • Yang, QunMax Planck Institute for Chemical Physics of Solids (author)
  • Lin, Mao (author)
  • Strocov, Vladimir N.Paul Scherrer Institute (author)
  • Caputo, MarcoPaul Scherrer Institute (author)
  • Watson, Matthew D.Diamond Light Source (author)
  • Kim, Timur K.Diamond Light Source (author)
  • Cacho, CephiseDiamond Light Source (author)
  • Mazzola, FedericoUniversity of Venice,CNR Istituto Officina dei Materiali (IOM) (author)
  • Fujii, JunCNR Istituto Officina dei Materiali (IOM) (author)
  • Vobornik, IvanaCNR Istituto Officina dei Materiali (IOM) (author)
  • Parkin, Stuart S.P.Max Planck Institute of Microstructure Physics (author)
  • Bradlyn, Barry (author)
  • Felser, ClaudiaMax Planck Institute for Chemical Physics of Solids (author)
  • Vergniory, Maia G.Donostia International Physics Center (DIPC),Max Planck Institute for Chemical Physics of Solids (author)
  • Schröter, Niels B.M.Max Planck Institute of Microstructure Physics (author)
  • Max Planck Institute of Microstructure PhysicsPaul Scherrer Institute (creator_code:org_t)

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  • In:Nature Communications15:12041-1723

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