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Title: Topological Nonsymmorphic Metals from Band Inversion

Abstract

Here, we expand the phase diagram of two-dimensional, nonsymmorphic crystals at integer fillings that do not guarantee gaplessness. In addition to the trivial, gapped phase that is expected, we find that band inversion leads to a class of topological, gapless phases. These topological phases are exemplified by the monolayers of MTe 2 (M ¼ W; Mo) if spin-orbit coupling is neglected. We characterize the Dirac band touching of these topological metals by theWilson loop of the non-Abelian Berry gauge field. Furthermore, we develop a criterion for the proximity of these topological metals to 2D and 3D Z 2 topological insulators when spinorbit coupling is included; our criterion is based on nonsymmorphic symmetry eigenvalues, and may be used to identify topological materials without inversion symmetry. An additional feature of the Dirac cone in monolayer MTe 2 is that it tilts over in a Lifshitz transition to produce electron and hole pockets—a type-II Dirac cone. These pockets, together with the pseudospin structure of the Dirac electrons, suggest a unified, topological explanation for the recently reported, nonsaturating magnetoresistance in WTe 2, as well as its circular dichroism in photoemission. We complement our analysis and first-principles band structure calculations with an ab-initio-derived tight-binding modelmore » for the WTe 2 monolayer.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Princeton Univ., NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1338137
Alternate Identifier(s):
OSTI ID: 1361405
Grant/Contract Number:  
FG02-05ER46201
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 6 Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Muechler, Lukas, Alexandradinata, A., Neupert, Titus, and Car, Roberto. Topological Nonsymmorphic Metals from Band Inversion. United States: N. p., 2016. Web. doi:10.1103/PhysRevX.6.041069.
Muechler, Lukas, Alexandradinata, A., Neupert, Titus, & Car, Roberto. Topological Nonsymmorphic Metals from Band Inversion. United States. doi:10.1103/PhysRevX.6.041069.
Muechler, Lukas, Alexandradinata, A., Neupert, Titus, and Car, Roberto. Thu . "Topological Nonsymmorphic Metals from Band Inversion". United States. doi:10.1103/PhysRevX.6.041069.
@article{osti_1338137,
title = {Topological Nonsymmorphic Metals from Band Inversion},
author = {Muechler, Lukas and Alexandradinata, A. and Neupert, Titus and Car, Roberto},
abstractNote = {Here, we expand the phase diagram of two-dimensional, nonsymmorphic crystals at integer fillings that do not guarantee gaplessness. In addition to the trivial, gapped phase that is expected, we find that band inversion leads to a class of topological, gapless phases. These topological phases are exemplified by the monolayers of MTe2 (M ¼ W; Mo) if spin-orbit coupling is neglected. We characterize the Dirac band touching of these topological metals by theWilson loop of the non-Abelian Berry gauge field. Furthermore, we develop a criterion for the proximity of these topological metals to 2D and 3D Z2 topological insulators when spinorbit coupling is included; our criterion is based on nonsymmorphic symmetry eigenvalues, and may be used to identify topological materials without inversion symmetry. An additional feature of the Dirac cone in monolayer MTe2 is that it tilts over in a Lifshitz transition to produce electron and hole pockets—a type-II Dirac cone. These pockets, together with the pseudospin structure of the Dirac electrons, suggest a unified, topological explanation for the recently reported, nonsaturating magnetoresistance in WTe2, as well as its circular dichroism in photoemission. We complement our analysis and first-principles band structure calculations with an ab-initio-derived tight-binding model for the WTe2 monolayer.},
doi = {10.1103/PhysRevX.6.041069},
journal = {Physical Review. X},
issn = {2160-3308},
number = 4,
volume = 6,
place = {United States},
year = {2016},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevX.6.041069

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Cited by: 11 works
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