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 |
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文章编号 | 106802 |
期刊 | Physical Review Letters |
卷 | 112 |
期 | 10 |
DOI | |
出版状态 | 已出版 - 12 3月 2014 |