Direct evidence for the dirac-cone topological surface states in the ternary chalcogenide TlBiSe2

Takafumi Sato; Kouji Segawa; Hua Guo; Katsuaki Sugawara; Seigo Souma; Takashi Takahashi; Yoichi Ando

doi:10.1103/PhysRevLett.105.136802

Direct evidence for the dirac-cone topological surface states in the ternary chalcogenide TlBiSe2

Takafumi Sato, Kouji Segawa, Hua Guo, Katsuaki Sugawara, Seigo Souma, Takashi Takahashi, Yoichi Ando

Research output: Contribution to journal › Article › peer-review

191 Citations (Scopus)

Abstract

We have performed angle-resolved photoemission spectroscopy on TlBiSe2, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an "X"-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe2 is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena.

Original language	English
Article number	136802
Journal	Physical review letters
Volume	105
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.105.136802
Publication status	Published - 2010 Sep 23

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1103/PhysRevLett.105.136802

Cite this

@article{0e91991da88d4e4bb55dc36a5fdd53ca,

title = "Direct evidence for the dirac-cone topological surface states in the ternary chalcogenide TlBiSe2",

abstract = "We have performed angle-resolved photoemission spectroscopy on TlBiSe2, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an {"}X{"}-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe2 is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena.",

author = "Takafumi Sato and Kouji Segawa and Hua Guo and Katsuaki Sugawara and Seigo Souma and Takashi Takahashi and Yoichi Ando",

year = "2010",

month = sep,

day = "23",

doi = "10.1103/PhysRevLett.105.136802",

language = "English",

volume = "105",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "13",

}

TY - JOUR

T1 - Direct evidence for the dirac-cone topological surface states in the ternary chalcogenide TlBiSe2

AU - Sato, Takafumi

AU - Segawa, Kouji

AU - Guo, Hua

AU - Sugawara, Katsuaki

AU - Souma, Seigo

AU - Takahashi, Takashi

AU - Ando, Yoichi

PY - 2010/9/23

Y1 - 2010/9/23

N2 - We have performed angle-resolved photoemission spectroscopy on TlBiSe2, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an "X"-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe2 is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena.

AB - We have performed angle-resolved photoemission spectroscopy on TlBiSe2, which is a member of the ternary chalcogenides theoretically proposed as candidates for a new class of three-dimensional topological insulators. We found direct evidence for a nontrivial surface metallic state showing an "X"-shaped energy dispersion within the bulk-band gap. The present result unambiguously establishes that TlBiSe2 is a strong topological insulator with a single Dirac cone at the Brillouin-zone center. The observed bulk-band gap of 0.35eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena.

UR - http://www.scopus.com/inward/record.url?scp=77957121442&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77957121442&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.105.136802

DO - 10.1103/PhysRevLett.105.136802

M3 - Article

AN - SCOPUS:77957121442

VL - 105

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 13

M1 - 136802

ER -

Direct evidence for the dirac-cone topological surface states in the ternary chalcogenide TlBiSe2

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this