论文标题
量子异常隔热器的可控手性和带隙
Controllable chirality and band gap of quantum anomalous Hall insulators
论文作者
论文摘要
寻找指导原则以优化量子异常霍尔（QAH）绝缘子的性能对于基本科学和应用至关重要。在这里，我们构建了手性和带隙的第一原理QAH材料数据库，探索确定QAH材料属性的微观机制，并获得可以全面了解QAH数据的一般物理图片。我们的结果表明，通常在大量的QAH材料中，通常被忽视的库仑交换意外强劲，这是解决实验难题的关键。此外，我们通过通过磁共同掺杂，异，旋转 - 轨道接近性来调整合作或竞争贡献来确定对QAH手性和差距进行控制的材料设计策略的简单指标。这项工作对于对磁性拓扑物理学和材料的未来研究非常有价值。
Finding guiding principles to optimize properties of quantum anomalous Hall (QAH) insulators is of pivotal importance to fundamental science and applications. Here, we build a first-principles QAH material database of chirality and band gap, explore microscopic mechanisms determining the QAH material properties, and obtain a general physical picture that can comprehensively understand the QAH data. Our results reveal that the usually neglected Coulomb exchange is unexpectedly strong in a large class of QAH materials, which is the key to resolve experimental puzzles. Moreover, we identify simple indicators for property evaluation and suggest material design strategies to control QAH chirality and gap by tuning cooperative or competing contributions via magnetic co-doping, heterostructuring, spin-orbit proximity, etc. The work is valuable to future research of magnetic topological physics and materials.
