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High-temperature and multichannel quantum anomalous Hall effect in pristine and alkali-metal-doped CrBr3 monolayers.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-12 , DOI: 10.1039/d0nr02829k Huisheng Zhang 1 , Wenjia Yang , Yaohui Ning , Xiaohong Xu
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-12 , DOI: 10.1039/d0nr02829k Huisheng Zhang 1 , Wenjia Yang , Yaohui Ning , Xiaohong Xu
Affiliation
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The realization of the high-temperature and multichannel quantum anomalous Hall effect (QAHE) has been a central research area in the development of low-power-consumption electronics and quantum computing. Recently discovered two-dimensional (2D) ferromagnetic (FM) materials provide unprecedented opportunities for the exploration of the high-temperature QAHE. Based on first-principles approaches, we first reveal that a FM CrBr3 monolayer harbors topologically nontrivial conduction bands with a high Chern number of C = 2. Then, we reveal that the interesting conduction bands can be moved downwards to the Fermi levels by electron and alkali–metal-doping; meanwhile, the QAHE characteristics can be preserved. Most strikingly, the Na-doped CrBr3 system possesses a higher Chern number of C = −4 with a transition temperature of ∼54 K, which is attributed to the constructive coupling effect of the quadratic non-Dirac and linear Dirac band dispersions. The present study, together with recent achievements in the field of 2D FM materials, provides an experimentally achievable guide for realizing the high-temperature and multichannel QAHE based purely on 2D FM systems.
中文翻译：
原始和掺杂碱金属的CrBr3单层中的高温多通道量子异常霍尔效应。
高温多通道量子异常霍尔效应（QAHE）的实现一直是低功耗电子学和量子计算发展的中心研究领域。最近发现的二维（2D）铁磁（FM）材料为探索高温QAHE提供了前所未有的机会。基于第一性原理，我们首先揭示出FM CrBr 3单层具有高Chern C = 2的拓扑非平凡导带。然后，我们揭示了有趣的导带可以被电子向下移动到费米能级和碱金属掺杂；同时，可以保留QAHE特性。最引人注目的是钠掺杂的CrBr 3该系统具有较高的Chern数C = -4，且转变温度为〜54 K，这归因于二次非Dirac和线性Dirac频带色散的构造耦合效应。本研究与2D FM材料领域的最新成就一起，为纯2D FM系统实现高温多通道QAHE提供了实验上可实现的指南。
更新日期：2020-07-09
中文翻译：
原始和掺杂碱金属的CrBr3单层中的高温多通道量子异常霍尔效应。
高温多通道量子异常霍尔效应（QAHE）的实现一直是低功耗电子学和量子计算发展的中心研究领域。最近发现的二维（2D）铁磁（FM）材料为探索高温QAHE提供了前所未有的机会。基于第一性原理，我们首先揭示出FM CrBr 3单层具有高Chern C = 2的拓扑非平凡导带。然后，我们揭示了有趣的导带可以被电子向下移动到费米能级和碱金属掺杂；同时，可以保留QAHE特性。最引人注目的是钠掺杂的CrBr 3该系统具有较高的Chern数C = -4，且转变温度为〜54 K，这归因于二次非Dirac和线性Dirac频带色散的构造耦合效应。本研究与2D FM材料领域的最新成就一起，为纯2D FM系统实现高温多通道QAHE提供了实验上可实现的指南。
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