Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2

Kumar N, Yao M, Nayak J, Vergniory MG, Bannies J, Wang Z, Schroeter NBM, Strocov VN, Muechler L, Shi W, Rienks EDL, Manes JL, Shekhar C, Parkin SSP, Fink J, Fecher GH, Sun Y, Bernevig BA, Felser C (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Advanced Materials Wiley

Book Volume: 32

Article Number: 1906046

Journal Issue: 11

DOI: 10.1002/adma.201906046

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.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Donostia International Physics Center (DIPC) ES Spain (ES) Princeton University US United States (USA) (US) Paul Scherrer Institute (PSI) CH Switzerland (CH) Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden e.V. (IFW) / Leibniz Institute for Solid State and Materials Research Dresden DE Germany (DE) University of Basque Country / Universidad del Pais Vasco (UPV) / Euskal Herriko Unibersitatea (EHU) ES Spain (ES) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE)

How to cite

APA:

Kumar, N., Yao, M., Nayak, J., Vergniory, M.G., Bannies, J., Wang, Z.,... Felser, C. (2020). Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2. Advanced Materials, 32(11). https://doi.org/10.1002/adma.201906046

MLA:

Kumar, Nitesh, et al. "Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2." Advanced Materials 32.11 (2020).

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