Multiple Types of Topological Fermions in Transition Metal Silicides
Abstract
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. Additionally, 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.
- Authors:
-
- Stanford Univ., Stanford, CA (United States)
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1418206
- Alternate Identifier(s):
- OSTI ID: 1409233
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 119; Journal Issue: 20; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Tang, Peizhe, Zhou, Quan, and Zhang, Shou -Cheng. Multiple Types of Topological Fermions in Transition Metal Silicides. United States: N. p., 2017.
Web. doi:10.1103/PhysRevLett.119.206402.
Tang, Peizhe, Zhou, Quan, & Zhang, Shou -Cheng. Multiple Types of Topological Fermions in Transition Metal Silicides. United States. https://doi.org/10.1103/PhysRevLett.119.206402
Tang, Peizhe, Zhou, Quan, and Zhang, Shou -Cheng. Fri .
"Multiple Types of Topological Fermions in Transition Metal Silicides". United States. https://doi.org/10.1103/PhysRevLett.119.206402. https://www.osti.gov/servlets/purl/1418206.
@article{osti_1418206,
title = {Multiple Types of Topological Fermions in Transition Metal Silicides},
author = {Tang, Peizhe and Zhou, Quan and Zhang, Shou -Cheng},
abstractNote = {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. Additionally, 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.},
doi = {10.1103/PhysRevLett.119.206402},
journal = {Physical Review Letters},
number = 20,
volume = 119,
place = {United States},
year = {2017},
month = {11}
}
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