Atomic Scale Quantum Anomalous Hall Effect in Monolayer Graphene/$\rm MnBi_{2}Te_{4}$ Heterostructure
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866910414966620160 |
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| author | Yao, Yueh-Ting Xu, Suyang Chang, Tay-Rong |
| author_facet | Yao, Yueh-Ting Xu, Suyang Chang, Tay-Rong |
| contents | 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 remain experimental evidence absent. In this work, we propose the QAH effect in graphene/$\rm MnBi_{2}Te_{4}$ (MBT) heterostructure based on density-functional theory (DFT). The monolayer MBT introduces spin-orbital coupling, Zeeman exchange field, and Kekul$\rm \acute{e}$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_05691 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Atomic Scale Quantum Anomalous Hall Effect in Monolayer Graphene/$\rm MnBi_{2}Te_{4}$ Heterostructure Yao, Yueh-Ting Xu, Suyang Chang, Tay-Rong Mesoscale and Nanoscale Physics Materials Science 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 remain experimental evidence absent. In this work, we propose the QAH effect in graphene/$\rm MnBi_{2}Te_{4}$ (MBT) heterostructure based on density-functional theory (DFT). The monolayer MBT introduces spin-orbital coupling, Zeeman exchange field, and Kekul$\rm \acute{e}$ 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. |
| title | Atomic Scale Quantum Anomalous Hall Effect in Monolayer Graphene/$\rm MnBi_{2}Te_{4}$ Heterostructure |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2401.05691 |