Frank, Tobias and Hoegl, Petra and Gmitra, Martin and Kochan, Denis and Fabian, Jaroslav (2018) Protected Pseudohelical Edge States in Z(2)-Trivial Proximitized Graphene. PHYSICAL REVIEW LETTERS, 120 (15): 156402. ISSN 0031-9007, 1079-7114
Full text not available from this repository. (Request a copy)Abstract
We investigate topological properties of models that describe graphene on realistic substrates which induce proximity spin-orbit coupling in graphene. A Z(2) phase diagram is calculated for the parameter space of (generally different) intrinsic spin-orbit coupling on the two graphene sublattices, in the presence of Rashba coupling. The most fascinating case is that of staggered intrinsic spin-orbit coupling which, despite being topologically trivial, Z(2) = 0, does exhibit edge states protected by time-reversal symmetry for zigzag ribbons as wide as micrometers. We call these states pseudohelical as their helicity is locked to the sublattice. The spin character and robustness of the pseudohelical modes is best exhibited on a finite flake, which shows that the edge states have zero g factor, carry a pure spin current in the cross section of the flake, and exhibit spin-flip reflectionless tunneling at the armchair edges.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HETEROSTRUCTURES; SPINTRONICS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Mar 2020 13:22 |
| Last Modified: | 10 Mar 2020 13:22 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14739 |
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