Quantum Oscillations and Hall Anomaly of Surface States in the Topological Insulator Bi2Te3

被引：777
作者：
Qu, Dong-Xia [1 ]
Hor, Y. S. [2 ]
Xiong, Jun [1 ]
Cava, R. J. [2 ]
Ong, N. P. [1 ]
机构：
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
来源：
SCIENCE | 2010年 / 329卷 / 5993期
基金：
美国国家科学基金会;
关键词：
PHASE;
D O I：
10.1126/science.1189792
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：
Topological insulators are insulating materials that display massless, Dirac-like surface states in which the electrons have only one spin degree of freedom on each surface. These states have been imaged by photoemission, but little information on their transport parameters, for example, mobility, is available. We report the observation of Shubnikov-de Haas oscillations arising from the surface states in nonmetallic crystals of Bi2Te3. In addition, we uncovered a Hall anomaly in weak fields, which enables the surface current to be seen directly. Both experiments yield a surface mobility (9000 to 10,000 centimeter(2) per volt-second) that is substantially higher than in the bulk. The Fermi velocity of 4 x 10(5) meters per second obtained from these transport experiments agrees with angle-resolved photoemission experiments.
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收藏
页码：821 / 824
页数：4
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