手性(物理)
量子霍尔效应
物理
凝聚态物理
量子力学
分数量子霍尔效应
霍尔效应
量子
量子自旋霍尔效应
理论物理学
电子
费米子
手征异常
磁场
Nambu–Jona Lasinio模型
作者
Hongyu Chen,Yuhao Jin,Mohammad Yahyavi,Ilya Belopolski,Sen Shao,Tao Hou,Naizhou Wang,Chia-Hsiu Hsu,Yong Zhao,Bo Ye,Qiong Ma,Jiaxin Yin,Su-Yang Xu,Weibo Gao,Guoqing Chang
出处
期刊:Physical review
日期:2024-03-12
卷期号:109 (12)
标识
DOI:10.1103/physrevb.109.125305
摘要
The ordinary and quantum Hall effects with fixed carrier types, electron or hole, exhibit well-defined chirality under external magnetic fields, but the analogous chirality of the quantum anomalous Hall effect (QAHE) remains little explored. Here, for the electronic structures of intrinsic QAHE systems, we show that the local Berry curvature is linked with the angular-momentum difference ${l}_{\ensuremath{\delta}z}$ of the inverted bands. In the presence of rotation symmetries, the value of ${l}_{\ensuremath{\delta}z}$ will be quantized and set as the Chern number. The quantized ${l}_{\ensuremath{\delta}z}$ will also give rise to a unique quantized magnetic circular dichroism effect in the case of resonance absorption. By ${l}_{\ensuremath{\delta}z}$, we find that the chiral flow-direction of an electron in the QAHE is not explicitly related to the intrinsic spin axis, thereby enabling the spin-momentum-unlocking edge states in an antiferromagnetic QAHE system. The validity of our theory is confirmed through rigorous examinations using perturbation theory, $\mathbf{k}\ifmmode\cdot\else\textperiodcentered\fi{}\mathbf{p}$ modeling, tight-binding modeling, and first-principle calculations, which predicts exotic behavior in experimentally accessible quantum materials.
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