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Title: Strong topological metal material with multiple Dirac cones

Abstract

We report a new, cleavable, strong topological metal, Zr 2Te 2P, which has the same tetradymite-type crystal structure as the topological insulator Bi 2Te 2Se. Instead of being a semiconductor, however, Zr 2Te 2P is metallic with a pseudogap between 0.2 and 0.7 eV above the Fermi energy (E F). Inside this pseudogap, two Dirac dispersions are predicted: one is a surface-originated Dirac cone protected by time-reversal symmetry (TRS), while the other is a bulk-originated and slightly gapped Dirac cone with a largely linear dispersion over a 2 eV energy range. A third surface TRS-protected Dirac cone is predicted, and observed using angle-resolved photoemission spectroscopy, making Z r2Te 2P the first system, to our knowledge, to realize TRS-protected Dirac cones at M¯ points. The high anisotropy of this Dirac cone is similar to the one in the hypothetical Dirac semimetal BiO 2. As a result, we propose that if E F can be tuned into the pseudogap where the Dirac dispersions exist, it may be possible to observe ultrahigh carrier mobility and large magnetoresistance in this material.

Authors:
 [1];  [2];  [3];  [1];  [1];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Princeton Univ., Princeton, NJ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1246802
Alternate Identifier(s):
OSTI ID: 1235963
Report Number(s):
BNL-111979-2016-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PM016; KC0202020
Grant/Contract Number:
SC00112704; AC02-05CH11231; SC0012704
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 4; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Ji, Huiwen, Valla, T., Pletikosic, I., Gibson, Q. D., Sahasrabudhe, Girija, and Cava, R. J. Strong topological metal material with multiple Dirac cones. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.045315.
Ji, Huiwen, Valla, T., Pletikosic, I., Gibson, Q. D., Sahasrabudhe, Girija, & Cava, R. J. Strong topological metal material with multiple Dirac cones. United States. doi:10.1103/PhysRevB.93.045315.
Ji, Huiwen, Valla, T., Pletikosic, I., Gibson, Q. D., Sahasrabudhe, Girija, and Cava, R. J. Mon . "Strong topological metal material with multiple Dirac cones". United States. doi:10.1103/PhysRevB.93.045315. https://www.osti.gov/servlets/purl/1246802.
@article{osti_1246802,
title = {Strong topological metal material with multiple Dirac cones},
author = {Ji, Huiwen and Valla, T. and Pletikosic, I. and Gibson, Q. D. and Sahasrabudhe, Girija and Cava, R. J.},
abstractNote = {We report a new, cleavable, strong topological metal, Zr2Te2P, which has the same tetradymite-type crystal structure as the topological insulator Bi2Te2Se. Instead of being a semiconductor, however, Zr2Te2P is metallic with a pseudogap between 0.2 and 0.7 eV above the Fermi energy (EF). Inside this pseudogap, two Dirac dispersions are predicted: one is a surface-originated Dirac cone protected by time-reversal symmetry (TRS), while the other is a bulk-originated and slightly gapped Dirac cone with a largely linear dispersion over a 2 eV energy range. A third surface TRS-protected Dirac cone is predicted, and observed using angle-resolved photoemission spectroscopy, making Zr2Te2P the first system, to our knowledge, to realize TRS-protected Dirac cones at M¯ points. The high anisotropy of this Dirac cone is similar to the one in the hypothetical Dirac semimetal BiO2. As a result, we propose that if EF can be tuned into the pseudogap where the Dirac dispersions exist, it may be possible to observe ultrahigh carrier mobility and large magnetoresistance in this material.},
doi = {10.1103/PhysRevB.93.045315},
journal = {Physical Review B},
number = 4,
volume = 93,
place = {United States},
year = {Mon Jan 25 00:00:00 EST 2016},
month = {Mon Jan 25 00:00:00 EST 2016}
}

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Cited by: 4works
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