Strong topological metal material with multiple Dirac cones

Ji, Huiwen; Valla, T.; Pletikosic, I.; Gibson, Q. D.; Sahasrabudhe, Girija; Cava, R. J.

doi:10.1103/PhysRevB.93.045315

Title: Strong topological metal material with multiple Dirac cones

Journal Article · Mon Jan 25 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.045315· OSTI ID:1246802

Ji, Huiwen ^[1]; Valla, T. ^[2]; Pletikosic, I. ^[3]; Gibson, Q. D. ^[1]; Sahasrabudhe, Girija ^[1]; Cava, R. J. ^[1]

Princeton Univ., Princeton, NJ (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Princeton Univ., Princeton, NJ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

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 (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_r2Te₂P 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 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.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704; AC02-05CH11231; SC0012704

OSTI ID:: 1246802

Alternate ID(s):: OSTI ID: 1235963

Report Number(s):: BNL-111979-2016-JA; PRBMDO; R&D Project: PM016; KC0202020

Journal Information:: Physical Review B, Vol. 93, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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First‐Principles Prediction of a New Family of Layered Topological Insulators Li, Ping; Yu, Jiangying; Xu, Jinrong Advanced Quantum Technologies, Vol. 2, Issue 11 https://doi.org/10.1002/qute.201900033	journal	August 2019
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