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arXiv 2202.13902cond-mat.mes-hallcond-mat.mtrl-scicond-mat.str-el
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学术讨论会:量子反常霍尔效应

Colloquium: Quantum anomalous Hall effect

Cui-Zu Chang, Chao-Xing Liu, Allan H. MacDonald

摘要:

量子霍尔(QH)效应,量子化霍尔电阻与零纵向电阻相结合,是陈氏绝缘体的特征实验指纹-具有破缺时间反转对称性的二维物质的拓扑非平凡态。在陈氏绝缘体中,非平凡的体能带拓扑结构由手性状态表示,该手性状态沿着样品边缘携带电流而没有耗散。量子反常霍尔(QAH)效应是指在没有外部磁场的情况下,由于时间反演对称性自发破缺而发生的QH效应。QAH效应现在已经在四种不同类别的二维材料中实现:(i)(Bi,Sb)2 Te 3族中的磁性(Cr-和/或V-)掺杂的拓扑绝缘体的薄膜,(ii)本征磁性拓扑绝缘体MnBi 2 Te 4的薄膜,(iii)由石墨烯形成的莫尔材料,以及(iv)由过渡金属二硫属化物形成的莫尔材料。在这篇文章中,我们回顾了负责每一类QAH绝缘体的物理机制,突出了差异和共性,并评论了QAH效应的潜在应用。

英文摘要:

The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal resistance, is the characteristic experimental fingerprint of Chern insulators - topologically non-trivial states of two-dimensional matter with broken time-reversal symmetry. In Chern insulators, non-trivial bulk band topology is expressed by chiral states that carry current along sample edges without dissipation. The quantum anomalous Hall (QAH) effect refers to QH effects that occur in the absence of external magnetic fields due to spontaneously broken time-reversal symmetry. The QAH effect has now been realized in four different classes of two-dimensional materials: (i) thin films of magnetically (Cr- and/or V-) doped topological insulators in the (Bi,Sb)2Te3 family, (ii) thin films of the intrinsic magnetic topological insulator MnBi2Te4, (iii) moiré materials formed from graphene, and (iv ) moiré materials formed from transition metal dichalcogenides. In this Article, we review the physical mechanisms responsible for each class of QAH insulator, highlighting both differences and commonalities, and comment on potential applications of the QAH effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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