Nature Communications (Jun 2021)

Momentum-space signatures of Berry flux monopoles in the Weyl semimetal TaAs

  • M. Ünzelmann,
  • H. Bentmann,
  • T. Figgemeier,
  • P. Eck,
  • J. N. Neu,
  • B. Geldiyev,
  • F. Diekmann,
  • S. Rohlf,
  • J. Buck,
  • M. Hoesch,
  • M. Kalläne,
  • K. Rossnagel,
  • R. Thomale,
  • T. Siegrist,
  • G. Sangiovanni,
  • D. Di Sante,
  • F. Reinert

DOI
https://doi.org/10.1038/s41467-021-23727-3
Journal volume & issue
Vol. 12, no. 1
pp. 1 – 7

Abstract

Read online

Weyl semimetals exhibit Berry flux monopoles in momentum-space, but direct experimental evidence has remained elusive. Here, the authors reveal topologically non-trivial winding of the orbital-angular-momentum at the Weyl nodes and a chirality-dependent spin-angular-momentum of the Weyl bands, as a direct signature of the Berry flux monopoles in TaAs.