High-temperature quantum anomalous Hall effect in honeycomb bilayer consisting of Au atoms and single-vacancy graphene.
High-temperature quantum anomalous Hall effect in honeycomb bilayer consisting of Au atoms and single-vacancy graphene.
复制标题
Au原子和单空位石墨烯蜂窝状双层中的高温量子反常霍尔效应
DOI：
10.1038/srep16843
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发表时间：
2015-11-17
影响因子：
4.6
通讯作者：
Wang GH
中科院分区：
文献类型：
--
作者：
Han Y;Wan JG;Ge GX;Song FQ;Wang GH
基于第一性原理计算，预言了高温下在Au原子和单空位石墨烯组成的蜂窝双层膜(Au2-SVG)中实现量子反常霍尔效应(QAHE)。我们证明了Au_2-Svg中的铁磁态可以维持到380K。空间反转对称性和Au原子引入的强自组织结构相结合，产生了高达36 meV的拓扑带隙和具有陈数C = −2的QAHE态。结合能分析证明了这种蜂窝双层膜是稳定的，并且在实验上是可行的。文中还讨论了TA2-SVG和其他TM2-SVG中的QAHEs。
The quantum anomalous Hall effect (QAHE) is predicted to be realized at high temperature in a honeycomb bilayer consisting of Au atoms and single-vacancy graphene (Au2-SVG) based on the first-principles calculations. We demonstrate that the ferromagnetic state in the Au2-SVG can be maintained up to 380 K. The combination of spatial inversion symmetry and the strong SOC introduced by the Au atoms causes a topologically nontrivial band gap as large as 36 meV and a QAHE state with Chern number C = −2. The analysis of the binding energy proved that the honeycomb bilayer is stable and feasible to be fabricated in experiment. The QAHEs in Ta2-SVG and other TM2-SVGs are also discussed.