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Title: 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 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:
 [1] ;  [1] ;  [2]
  1. Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515
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)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1418206
Alternate Identifier(s):
OSTI ID: 1409233

Tang, Peizhe, Zhou, Quan, and Zhang, Shou -Cheng. Multiple Types of Topological Fermions in Transition Metal Silicides. United States: N. p., 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. doi:10.1103/PhysRevLett.119.206402.
Tang, Peizhe, Zhou, Quan, and Zhang, Shou -Cheng. 2017. "Multiple Types of Topological Fermions in Transition Metal Silicides". United States. doi: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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