Atomic scale quantum anomalous hall effect in monolayer graphene/MnBi2Te4 heterostructure.
Mater Horiz
; 11(14): 3420-3426, 2024 Jul 15.
Article
in En
| MEDLINE
| ID: mdl-38691397
ABSTRACT
The two-dimensional quantum anomalous Hall (QAH) effect is direct evidence of non-trivial Berry curvature topology in condensed matter physics. Searching for QAH in 2D materials, particularly with simplified fabrication methods, poses a significant challenge in future applications. Despite numerous theoretical works proposed for the QAH effect with C = 2 in graphene, neglecting magnetism sources such as proper substrate effects lacks experimental evidence. In this work, we propose the QAH effect in graphene/MnBi2Te4 (MBT) heterostructure based on density-functional theory (DFT) calculations. The monolayer MBT introduces spin-orbital coupling, Zeeman exchange field, and Kekulé distortion as a substrate effect into graphene, resulting in QAH with C = 1 in the heterostructure. Our effective Hamiltonian further presents a rich phase diagram that has not been studied previously. Our work provides a new and practical way to explore the QAH effect in monolayer graphene and the magnetic topological phases by the flexibility of MBT family materials.
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01-internacional
Database:
MEDLINE
Language:
En
Journal:
Mater Horiz
Year:
2024
Document type:
Article
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