Weyl spin-momentum locking in a chiral topological semimetal.

Journal

Nature communications

ISSN: 2041-1723

Titre abrégé: Nat Commun

Pays: England

ID NLM: 101528555

Informations de publication

Date de publication:
02 May 2024

Historique:

received: 27 10 2023

accepted: 17 04 2024

medline: 3 5 2024

pubmed: 3 5 2024

entrez: 2 5 2024

Statut: epublish

Résumé

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.

Identifiants

DOI: 10.1038/s41467-024-47976-0 PMID: 38697958

pubmed: 38697958

doi: 10.1038/s41467-024-47976-0

pii: 10.1038/s41467-024-47976-0

doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

Pagination

3720

Subventions

Organisme : EC | EU Framework Programme for Research and Innovation H2020 | H2020 Priority Excellent Science | H2020 European Research Council (H2020 Excellent Science - European Research Council)

ID : 101117424

Informations de copyright

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