Moire-enabled topological superconductivity in twisted bilayer graphene
| Autor: | Khosravian, Maryam, Bascones, Elena, Lado, Jose L. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | 2D Materials 11 (3), 035012 (2024) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/2053-1583/ad3b0c |
| Popis: | Twisted van der Waals materials have risen as highly tunable platform for realizing unconventional superconductivity. Here we demonstrate how a topological superconducting state can be driven in a twisted graphene multilayer at a twist angle of approximately 1.6 degrees proximitized to other 2D materials. We show that an encapsulated twisted bilayer subject to induced Rashba spin-orbit coupling, s-wave superconductivity and exchange field generates a topological superconducting state enabled by the moire pattern. We demonstrate a variety of topological states with different Chern numbers highly tunable through doping, strain and bias voltage. Our proposal does not depend on a fine tuning of the twist angle, but solely on the emergence of moire minibands and is applicable for twist angles between 1.3 and 3 degrees. Our results establish the potential of twisted graphene bilayers to create artificial topological superconductivity without requiring ultraflat dispersions. Comment: 6 pages, 3 figures |
| Databáze: | arXiv |
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