Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2

Nitesh Kumar, Mengyu Yao, Jayita Nayak, Maia G. Vergniory, Jörn Bannies, Zhijun Wang, Niels B.M. Schröter, Vladimir N. Strocov, Lukas Müchler, Wujun Shi, Emile D.L. Rienks, J. L. Mañes, Chandra Shekhar, Stuart S.P. Parkin, Jörg Fink, Gerhard H. Fecher, Yan Sun, B. Andrei Bernevig, Claudia Felser

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3 Scopus citations

Abstract

Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb2 hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin–orbit interaction, a band inversion occurs.

Original languageEnglish (US)
Article number1906046
JournalAdvanced Materials
Volume32
Issue number11
DOIs
StatePublished - Mar 1 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • angle-resolved photoemission spectroscopy
  • electronic structure
  • first principle calculations
  • multifold degenerate points
  • topological materials

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    Kumar, N., Yao, M., Nayak, J., Vergniory, M. G., Bannies, J., Wang, Z., Schröter, N. B. M., Strocov, V. N., Müchler, L., Shi, W., Rienks, E. D. L., Mañes, J. L., Shekhar, C., Parkin, S. S. P., Fink, J., Fecher, G. H., Sun, Y., Bernevig, B. A., & Felser, C. (2020). Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2 Advanced Materials, 32(11), [1906046]. https://doi.org/10.1002/adma.201906046