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Radial Spin Texture of the Weyl Fermions in Chiral Tellurium


Abstract

Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy its unconventional electronic structure and unique spin texture. We identify Kramers–Weyl, composite, and accordionlike Weyl fermions, so far only predicted by theory, and show that the spin polarization is parallel to the wave vector along the lines in k space connecting high-symmetry points. Our results clarify the symmetries that enforce such spin texture in a chiral crystal, thus bringing new insight in the formation of a spin vectorial field more complex than the previously proposed hedgehog configuration. Our findings thus pave the way to a classification scheme for these exotic spin textures and their search in chiral crystals.

Abstract

Trigonal tellurium, a small-gap semiconductor with pronounced magneto-electric and magneto-optical responses, is among the simplest realizations of a chiral crystal. We have studied by spin- and angle-resolved photoelectron spectroscopy its unconventional electronic structure and unique spin texture. We identify Kramers–Weyl, composite, and accordionlike Weyl fermions, so far only predicted by theory, and show that the spin polarization is parallel to the wave vector along the lines in k space connecting high-symmetry points. Our results clarify the symmetries that enforce such spin texture in a chiral crystal, thus bringing new insight in the formation of a spin vectorial field more complex than the previously proposed hedgehog configuration. Our findings thus pave the way to a classification scheme for these exotic spin textures and their search in chiral crystals.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:19 November 2020
Deposited On:28 Dec 2020 12:36
Last Modified:01 Jan 2021 15:19
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.125.216402
Project Information:
  • : FunderSNSF
  • : Grant IDPP00P2_176877
  • : Project TitleTopological Phases: From New Fermions to Materials and Devices
  • : FunderSNSF
  • : Grant ID200020_188648
  • : Project TitleQuantum Magnetism - from fundamentals to applications
  • : FunderSNSF
  • : Grant IDP2ELP2_181877
  • : Project TitleCombining spin polarization and attosecond time delay in photoemission
  • : FunderH2020
  • : Grant ID695197
  • : Project TitleDYNAMOX - Charge carrier dynamics in metal oxides
  • : FunderH2020
  • : Grant ID757867
  • : Project TitlePARATOP - New paradigms for correlated quantum matter: Hierarchical topology, Kondo topological metals, and deep learning

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