Quantum anomalous Hall effect in graphene proximity coupled to an antiferromagnetic insulator
We propose realizing the quantum anomalous Hall effect by proximity coupling graphene to an antiferromagnetic insulator that provides both broken time-reversal symmetry and spin-orbit coupling. We illustrate our idea by performing ab initio calculations for graphene adsorbed on the (111) surface of...
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| Veröffentlicht in: | Physical review letters 2014-03, Vol.112 (11), p.116404-116404, Article 116404 |
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| container_title | Physical review letters |
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| creator | Qiao, Zhenhua Ren, Wei Chen, Hua Bellaiche, L Zhang, Zhenyu Macdonald, A H Niu, Qian |
| description | We propose realizing the quantum anomalous Hall effect by proximity coupling graphene to an antiferromagnetic insulator that provides both broken time-reversal symmetry and spin-orbit coupling. We illustrate our idea by performing ab initio calculations for graphene adsorbed on the (111) surface of BiFeO3. In this case, we find that the proximity-induced exchange field in graphene is about 70 meV, and that a topologically nontrivial band gap is opened by Rashba spin-orbit coupling. The size of the gap depends on the separation between the graphene and the thin film substrate, which can be tuned experimentally by applying external pressure. |
| doi_str_mv | 10.1103/physrevlett.112.116404 |
| format | Article |
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| source | American Physical Society Journals |
| title | Quantum anomalous Hall effect in graphene proximity coupled to an antiferromagnetic insulator |
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