Direct Evidence for the Dirac-Cone Topological Surface States in the Ternary Chalcogenide TlBiSe2

被引：199

作者：

Sato, Takafumi ^{[1
]}

Segawa, Kouji ^{[2
]}

Guo, Hua ^{[1
]}

Sugawara, Katsuaki ^{[3
]}

Souma, Seigo ^{[3
]}

Takahashi, Takashi ^{[1
,3
]}

Ando, Yoichi ^{[2
]}

机构：

[1] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[2] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan

[3] Tohoku Univ, WPI Res Ctr, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 13期

关键词：

HGTE QUANTUM-WELLS; SPIN; INSULATOR; BI2TE3; PHASE;

D O I：

10.1103/PhysRevLett.105.136802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 0.35 eV is the largest among known topological insulators, making TlBiSe2 the most promising material for studying room-temperature topological phenomena.

引用

页数：4

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