Multiple Types of Topological Fermions in Transition Metal Silicides

Exotic massless fermionic excitations with nonzero Berry flux, other than the Dirac and Weyl fermions, could exist in condensed matter systems under the protection of crystalline symmetries, such as spin-1 excitations with threefold degeneracy and spin-3/2 Rarita-Schwinger-Weyl fermions. Herein, by...

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Veröffentlicht in:Physical review letters Jg. 119; H. 20; S. 206402
Hauptverfasser: Tang, Peizhe, Zhou, Quan, Zhang, Shou-Cheng
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States American Physical Society (APS) 17.11.2017
Schlagworte:
ATOMIC AND MOLECULAR PHYSICS
ISSN:0031-9007, 1079-7114, 1079-7114
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Zusammenfassung:Exotic massless fermionic excitations with nonzero Berry flux, other than the Dirac and Weyl fermions, could exist in condensed matter systems under the protection of crystalline symmetries, such as spin-1 excitations with threefold degeneracy and spin-3/2 Rarita-Schwinger-Weyl fermions. Herein, by using the ab initio density functional theory, we show that these unconventional quasiparticles coexist with type-I and type-II Weyl fermions in a family of transition metal silicides, including CoSi, RhSi, RhGe, and CoGe, when spin-orbit coupling is considered. Their nontrivial topology results in a series of extensive Fermi arcs connecting projections of these bulk excitations on the side surface, which is confirmed by (001) surface electronic spectra of CoSi. In addition, these stable arc states exist within a wide energy window around the Fermi level, which makes them readily accessible in angle-resolved photoemission spectroscopy measurements.
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USDOE Office of Science (SC), Basic Energy Sciences (BES)
AC02-76SF00515
ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.119.206402