Valley-Polarized Quantum Anomalous Hall Effect in Silicene
Valley-Polarized Quantum Anomalous Hall Effect in Silicene
复制标题
硅烯中的谷偏振量子反常霍尔效应
DOI：
10.1103/physrevlett.112.106802
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发表时间：
2014-03-12
影响因子：
8.6
通讯作者：
Yao, Yugui
中科院分区：
文献类型：
--
作者：
Pan, Hui;Li, Zhenshan;Yao, Yugui
我们在理论上发现了一种新的物质量子态——硅烯中的谷偏振量子反常霍尔态。在存在 Rashba 自旋轨道耦合和交换场的情况下，硅烯具有陈省数 C = 2 的量子反常霍尔态。我们表明，通过调整 Rashba 自旋轨道耦合，拓扑相变会产生谷极化量子反常霍尔态，即表现出量子谷霍尔态（谷陈数 C-v = 3) 和量子反常霍尔态，C = -1。这一发现为以更稳健的方式设计无耗散谷电子学提供了一个平台。
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 C-v = 3) and quantum anomalous Hall state with C = -1. This finding provides a platform for designing dissipationless valleytronics in a more robust manner.