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中国物理学会期刊

二维材料中贝里曲率诱导的磁性响应

CSTR: 32037.14.aps.70.20202132

Berry curvature-induced emerging magnetic response in two-dimensional materials

CSTR: 32037.14.aps.70.20202132
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  • 二维材料中由贝里曲率诱导的新型磁学响应是近年来的新兴领域. 这些二维材料所表现出的磁学特性及量子输运与贝里曲率直接相关, 而贝里曲率又与晶体的对称性、电子的轨道磁性、自旋轨道耦合以及磁电效应等息息相关. 研究这些新型磁性响应一方面有益于研究不同量子效应间的耦合作用, 另一方面可探索量子效应在电子与信息器件领域的应用. 本文介绍了近几年来二维材料中新型磁响应的实验研究进展, 特别介绍了二硫化钼和石墨烯等材料中的谷霍尔和磁电效应、低对称性的二碲化钨等材料中的量子非线性霍尔以及转角石墨烯中的反常霍尔和量子反常霍尔效应. 本文结合二维材料的晶体结构以及电子结构, 介绍了这些新奇现象的现有物理解释、回顾了相关研究的最新发展、讨论了其中尚未理解的现象, 并作出展望.

     

    The magnetic response in a two-dimensional material has received increasing attention in recent years. The magnetic effects and related quantum transport originate from Berry curvature, which is associated with crystal symmetry and many quantum effects including electrons’ orbital magnetism, spin-orbit coupling, and magnetoelectricity. The importance of studying the magnetic response in the two-dimensional material lies in two aspects. First, the magnetic response of two-dimensional material provides a platform to investigate the coupling between the above-mentioned intrinsic quantum effects and their couplings. Second, it possesses the potential applications in energy-efficient quantum and spintronic devices. Here, we review the experimental research progress made in recent years. In particular, we focus on the research progress of the valley Hall and magnetoelectric effect, quantum non-linear Hall effect, anomalous Hall, and quantum anomalous Hall effect in two-dimensional materials such as graphene, transition-metal chalcogenides, and twisted bilayer graphene. For each session, we first introduce these phenomena and their underlying physics by using crystal symmetries and band structures. Then, we summarize the experimental results and identify unsolved problems. At last, we provide an outlook in this emerging research direction.

     

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