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research article

Radial Spin Texture of the Weyl Fermions in Chiral Tellurium

Gatti, G.  
•
Gosalbez-Martinez, D.  
•
Tsirkin, S. S.
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November 19, 2020
Physical Review Letters

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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Type
research article
DOI
10.1103/PhysRevLett.125.216402
Web of Science ID

WOS:000590412500009

Author(s)
Gatti, G.  
Gosalbez-Martinez, D.  
Tsirkin, S. S.
Fanciulli, M.
Puppin, M.  
Polishchuk, S.  
Moser, S.
Testa, L.  
Martino, E.  
Roth, S.  
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Date Issued

2020-11-19

Publisher

AMER PHYSICAL SOC

Published in
Physical Review Letters
Volume

125

Issue

21

Article Number

216402

Subjects

Physics, Multidisciplinary

•

Physics

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
C3MP  
LQM  
LSE  
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Available on Infoscience
December 3, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/173848
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