AI Article Synopsis
- The study investigates the layer-dependent Chern number (C) in MnBi_{2}Te_{4}, focusing on its C=2 state associated with a Weyl semimetal state under ferromagnetic coupling.
- It emphasizes the previously unexplored role of exchange coupling, which significantly impacts the formation of the Chern states and introduces competition between C=1 and C=2 states.
- Findings also reveal odd-even Landau level sequences, indicating strong exchange coupling and underscoring its importance in understanding Chern states and Landau levels in magnetic quantum systems.
Article Abstract
The layer-dependent Chern number (C) in MnBi_{2}Te_{4} 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 MnBi_{2}Te_{4}, 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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| http://dx.doi.org/10.1103/PhysRevLett.132.146601 | DOI Listing |
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