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Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2
Authors
Jörn Bannies
B. Andrei Bernevig
+17 more
Gerhard H. Fecher
Claudia Felser
Jörg Fink
Nitesh Kumar
J.L. Mañes
Lukas Müchler
Jayita Nayak
Stuart S.P. Parkin
Emile D.L. Rienks
Niels B.M. Schröter
Chandra Shekhar
Wujun Shi
Vladimir N. Strocov
Yan Sun
Maia G. Vergniory
Zhijun Wang
Mengyu Yao
Publication date
1 January 2020
Publisher
Weinheim : Wiley-VCH
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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. © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei
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Last time updated on 23/07/2022