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Strong topological metal material with multiple Dirac cones

Author(s): Ji, Huiwen; Pletikosić, Ivo's; Gibson, Quinn D.; Sahasrabudhe, Girija S.; Valla, Tonica; et al

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Abstract: © 2016 American Physical Society.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. 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.
Publication Date: 15-Jan-2016
Electronic Publication Date: 25-Jan-2016
Citation: Ji, H., Pletikosić, I., Gibson, Q.D., Sahasrabudhe, G., Valla, T., Cava, R.J. (2016). Strong topological metal material with multiple Dirac cones. Physical Review B - Condensed Matter and Materials Physics, 93 (4), 10.1103/PhysRevB.93.045315
DOI: doi:10.1103/PhysRevB.93.045315
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 93.4:045315-1 -045315-6
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B - Condensed Matter and Materials Physics
Version: Final published version. This is an open access article.
Notes: Physical Review B. Volume 93, Issue 4, 25 January 2016, Article number 045315.

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