Zollner, Klaus and Fabian, Jaroslav (2022) Engineering Proximity Exchange by Twisting: Reversal of Ferromagnetic and Emergence of Antiferromagnetic Dirac Bands in Graphene/Cr2Ge2Te6. PHYSICAL REVIEW LETTERS, 128 (1): 106401. ISSN 0031-9007, 1079-7114
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We investigate the twist-angle and gate dependence of the proximity exchange coupling in twisted graphene on monolayer Cr2Ge2Te6 from first principles. The proximitized Dirac band dispersions of graphene are fitted to a model Hamiltonian, yielding effective sublattice-resolved proximity-induced exchange parameters (AAex and ABex) for a series of twist angles between 0 degrees and 30 degrees. For aligned layers (0 degrees twist angle), the exchange coupling of graphene is the same on both sublattices, AAex ABex 4 meV, while the coupling is reversed at 30 degrees (with AAex ABex -4 meV). Remarkably, at 19.1 degrees the induced exchange coupling becomes antiferromagnetic: AAex 0, ABex 0. Further tuning is provided by a transverse electric field and the interlayer distance. The predicted proximity magnetization reversal and emergence of an antiferromagnetic Dirac dispersion make twisted graphene/Cr2Ge2Te6 bilayers a versatile platform for realizing topological phases and for spintronics applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPIN-ORBIT INTERACTION; GRAPHENE; INSULATOR; SUPERCONDUCTIVITY; INTERFACE; SUPERCELL; GRAPHITE; CRYSTALS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Nov 2023 09:40 |
| Last Modified: | 07 Nov 2023 09:40 |
| URI: | https://pred.uni-regensburg.de/id/eprint/56652 |
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