Strong topological metal material with multiple Dirac cones
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- 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. https://doi.org/10.1103/PhysRevB.93.045315
Ji, Huiwen, Valla, T., Pletikosic, I., Gibson, Q. D., Sahasrabudhe, Girija, and Cava, R. J. 2016.
"Strong topological metal material with multiple Dirac cones". United States. https://doi.org/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},
url = {https://www.osti.gov/biblio/1246802},
journal = {Physical Review B},
issn = {2469-9950},
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}
}
Web of Science
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