Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

被引：3022

作者：

Chen, Y. L. ^{[1
,2
,3
,4
]}

Analytis, J. G. ^{[1
,2
,3
]}

Chu, J. -H. ^{[1
,2
,3
]}

Liu, Z. K. ^{[1
,2
,3
]}

Mo, S. -K. ^{[1
,2
,3
,4
]}

Qi, X. L. ^{[1
,2
,3
]}

Zhang, H. J. ^{[5
,6
]}

Lu, D. H. ^{[1
]}

Dai, X. ^{[5
,6
]}

Fang, Z. ^{[5
,6
]}

Zhang, S. C. ^{[1
,2
,3
]}

Fisher, I. R. ^{[1
,2
,3
]}

Hussain, Z. ^{[4
]}

Shen, Z. -X. ^{[1
,2
,3
]}

机构：

[1] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[2] Stanford Univ, Dept Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[3] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[5] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[6] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

SCIENCE | 2009年 / 325卷 / 5937期

关键词：

HGTE QUANTUM-WELLS; SINGLE DIRAC CONE; SURFACE; PHASE; TRANSITION; STATE;

D O I：

10.1126/science.1173034

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Three-dimensional topological insulators are a new state of quantum matter with a bulk gap and odd number of relativistic Dirac fermions on the surface. By investigating the surface state of Bi2Te3 with angle-resolved photoemission spectroscopy, we demonstrate that the surface state consists of a single nondegenerate Dirac cone. Furthermore, with appropriate hole doping, the Fermi level can be tuned to intersect only the surface states, indicating a full energy gap for the bulk states. Our results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface. The large bulk gap of Bi2Te3 also points to promising potential for high-temperature spintronics applications.

引用

页码：178 / 181

页数：4

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