TY - JOUR
T1 - Exchange-Driven Chern States in High-Mobility Intrinsic Magnetic Topological Insulators
AU - Chong, Su Kong
AU - Lei, Chao
AU - Cheng, Yang
AU - Lee, Seng Huat
AU - Mao, Zhiqiang
AU - Macdonald, Allan H.
AU - Wang, Kang L.
N1 - Publisher Copyright:
© 2024 American Physical Society.
PY - 2024/4/5
Y1 - 2024/4/5
N2 - The layer-dependent Chern number (C) in MnBi2Te4 is characterized by the presence of a Weyl semimetal state in the ferromagnetic coupling. However, the influence of a key factor, namely, the exchange coupling, remains unexplored. This study focuses on characterizing the C=2 state in MnBi2Te4, which is classified as a higher C state resulting from the anomalous n=0 Landau levels (LLs). Our findings demonstrate that the exchange coupling parameter strongly influences the formation of this Chern state, leading to a competition between the C=1 and 2 states. Moreover, the emergence of odd-even LL sequences, resulting from the breaking of LL degeneracy, provides compelling evidence for the strong exchange coupling strength. These findings highlight the significance of the exchange coupling in understanding the behavior of Chern states and LLs in magnetic quantum systems.
AB - The layer-dependent Chern number (C) in MnBi2Te4 is characterized by the presence of a Weyl semimetal state in the ferromagnetic coupling. However, the influence of a key factor, namely, the exchange coupling, remains unexplored. This study focuses on characterizing the C=2 state in MnBi2Te4, which is classified as a higher C state resulting from the anomalous n=0 Landau levels (LLs). Our findings demonstrate that the exchange coupling parameter strongly influences the formation of this Chern state, leading to a competition between the C=1 and 2 states. Moreover, the emergence of odd-even LL sequences, resulting from the breaking of LL degeneracy, provides compelling evidence for the strong exchange coupling strength. These findings highlight the significance of the exchange coupling in understanding the behavior of Chern states and LLs in magnetic quantum systems.
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U2 - 10.1103/PhysRevLett.132.146601
DO - 10.1103/PhysRevLett.132.146601
M3 - Article
C2 - 38640375
AN - SCOPUS:85189370150
SN - 0031-9007
VL - 132
JO - Physical review letters
JF - Physical review letters
IS - 14
M1 - 146601
ER -