Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.106401
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Funding
- Deutsche Forschungsge-meinschaft (DFG, German Research Foundation) [314695032, SPP 2244, 443416183, SFB 1277]
- European Union [881603]
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This study investigates the twist-angle and gate dependence of the proximity exchange coupling in twisted graphene on monolayer Cr2Ge2Te6 from first principles. The results show that the twist angle has a significant impact on the exchange coupling of graphene, which can be further controlled by a transverse electric field and the interlayer distance.
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.
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