Valley-polarized quantum anomalous hall effect in silicene

Hui Pan, Zhenshan Li, Cheng Cheng Liu, Guobao Zhu, Zhenhua Qiao, Yugui Yao

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摘要

We find theoretically a new quantum state of matter - the valley-polarized quantum anomalous Hall state in silicene. In the presence of Rashba spin-orbit coupling and an exchange field, silicene hosts a quantum anomalous Hall state with Chern number C=2. We show that through tuning the Rashba spin-orbit coupling, a topological phase transition results in a valley-polarized quantum anomalous Hall state, i.e., a quantum state that exhibits the electronic properties of both the quantum valley Hall state (valley Chern number Cv=3) and quantum anomalous Hall state with C=-1. This finding provides a platform for designing dissipationless valleytronics in a more robust manner.

源语言英语
文章编号106802
期刊Physical Review Letters
112
10
DOI
出版状态已出版 - 12 3月 2014

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Pan, H., Li, Z., Liu, C. C., Zhu, G., Qiao, Z., & Yao, Y. (2014). Valley-polarized quantum anomalous hall effect in silicene. Physical Review Letters, 112(10), 文章 106802. https://doi.org/10.1103/PhysRevLett.112.106802