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
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
收藏
页码:178 / 181
页数:4
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