Zhumagulov, Yaroslav and Frank, Tobias and Fabian, Jaroslav (2022) Edge states in proximitized graphene ribbons and Hakes in a perpendicular magnetic field: Emergence of lone pseudohelical pairs and pure spin-current states. PHYSICAL REVIEW B, 105 (20): 205134. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
We investigate the formation of edge states in graphene ribbons and flakes with proximity-induced valleyZeeman and Rashba spin-orbit couplings in the presence of a perpendicular magnetic field B. Two types of edge states appear in the spin-orbit gap at the Fermi level at zero field: strongly localized pseudohelical (intervalley) states and weakly localized intravalley states. We show that if the magnetic field is stronger than a crossover field Bc, which is a few milliteslas for realistic systems such as graphene/WSe2, only the pseudohelical edge states remain in zigzag graphene ribbons; the intravalley states disappear. The crossover is directly related to the closing and reopening of the bulk gap formed between nonzero Landau levels. Remarkably, in finite flakes the pseudohelical states undergo perfect reflection at the armchair edges if B > Bc, forming standing waves at the zigzag edges. These standing waves comprise two counterpropagating pseudohelical states; so while they carry no charge current, they do carry (pure) spin current.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Nov 2023 08:14 |
| Last Modified: | 14 Nov 2023 08:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/56646 |
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