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 journalArticlepeer-review

181 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 languageEnglish
Article number136802
JournalPhysical review letters
Volume105
Issue number13
DOIs
Publication statusPublished - 2010 Sep 23

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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