凝聚态物理
拓扑绝缘体
物理
量子自旋霍尔效应
量子反常霍尔效应
磁场
量子霍尔效应
霍尔效应
自旋轨道相互作用
联轴节(管道)
自旋(空气动力学)
量子力学
材料科学
热力学
冶金
作者
Rui Yu,Wei Zhang,Haijun Zhang,Shou-Cheng Zhang,Xi Dai,Zhong Fang
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2010-07-02
卷期号:329 (5987): 61-64
被引量:1844
标识
DOI:10.1126/science.1187485
摘要
The anomalous Hall effect is a fundamental transport process in solids arising from the spin-orbit coupling. In a quantum anomalous Hall insulator, spontaneous magnetic moments and spin-orbit coupling combine to give rise to a topologically nontrivial electronic structure, leading to the quantized Hall effect without an external magnetic field. Based on first-principles calculations, we predict that the tetradymite semiconductors Bi2Te3, Bi2Se3, and Sb2Te3 form magnetically ordered insulators when doped with transition metal elements (Cr or Fe), in contrast to conventional dilute magnetic semiconductors where free carriers are necessary to mediate the magnetic coupling. In two-dimensional thin films, this magnetic order gives rise to a topological electronic structure characterized by a finite Chern number, with the Hall conductance quantized in units of e2/h (where e is the charge of an electron and h is Planck's constant).
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