Hoegl, Petra and Frank, Tobias and Zollner, Klaus and Kochan, Denis and Gmitra, Martin and Fabian, Jaroslav (2020) Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling. PHYSICAL REVIEW LETTERS, 124 (13): 136403. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
We investigate an effective model of proximity modified graphene (or symmetrylike materials) with broken time-reversal symmetry. We predict the appearance of quantum anomalous Hall phases by computing bulk band gap and Chern numbers for benchmark combinations of system parameters. Allowing for staggered exchange field enables quantum anomalous Hall effect in flat graphene with Chern number C = 1. We explicitly show edge states in zigzag and armchair nanoribbons and explore their localization behavior. Remarkably, the combination of staggered intrinsic spin-orbit and uniform exchange coupling gives topologically protected (unlike in time-reversal systems) pseudohelical states, whose spin is opposite in opposite zigzag edges. Rotating the magnetization from out of plane to in plane makes the system trivial, allowing us to control topological phase transitions. We also propose, using density functional theory, a material platform-graphene on Ising antiferromagnet MnPSe3-to realize staggered exchange (pseudospin Zeeman) coupling.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | GRAPHITE; MNPSE3; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Mar 2021 07:05 |
| Last Modified: | 29 Mar 2021 07:05 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44884 |
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