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所属单位：[1]Univ Elect Sci & Technol China, Sch Phys, Chengdu 611731, Peoples R China;[2]Great Bay Univ, Sch Sci, Dongguan 523000, Peoples R China;[3]Univ Hong Kong, Dept Phys, Pokfulam Rd, Hong Kong, Peoples R China

发表刊物：PHYSICAL REVIEW B

关键字：Electric insulators - Quantum Hall effect - Topological insulators

摘要：The pursuit of understanding the parity anomaly in condensed matter systems has led to significant advancements in both theoretical and experimental research in recent years. In this paper, we explore the parity anomaly of massless Dirac fermions in a semimagnetic topological insulator (TI) thin film subjected to a finite magnetic field. Our findings reveal an anomalous half-quantized Hall conductance arising from the occupied electronic states far below the Fermi level, which is directly associated with the parity anomaly. This observation demonstrates a crossover from one-half quantized Hall conductance in a metallic phase at zero field to one or zero quantized Hall conductance in the insulating phase at a strong field in the presence of disorders, serving as a key indicator for confirming parity anomaly. Our work provides valuable insights into the intricate relationship between band topology in condensed matter systems and quantum anomaly in quantum field theory.

全部作者：Bo Fu

第一作者：Huan-Wen Wang

论文类型：Journal Article

通讯作者：Shun-Qing Shen

文献类型：Article

卷号：109

期号：7

ISSN号：2469-9950

是否译文：否