Mrenca-Kolasinska, Alina and Rickhaus, Peter and Zheng, Giulia and Richter, Klaus and Ihn, Thomas and Ensslin, Klaus and Liu, Ming-Hao (2022) Quantum capacitive coupling between large-angle twisted graphene layers. 2D MATERIALS, 9 (2): 025013. ISSN 2053-1583
Full text not available from this repository. (Request a copy)Abstract
Large-angle twisted bilayer graphene (tBLG) is known to be electronically decoupled due to the spatial separation of the Dirac cones corresponding to individual graphene layers in the reciprocal space. The close spacing between the layers causes strong capacitive coupling, opening possibilities for applications in atomically thin devices. Here, we present a self-consistent quantum capacitance model for the electrostatics of decoupled graphene layers, and further generalize it to deal with decoupled tBLG at finite magnetic field and large-angle twisted double bilayer graphene at zero magnetic field. We probe the capacitive coupling through the conductance, showing good agreement between simulations and experiments for all the systems considered. We also propose a new experiment utilizing the decoupling effect to induce a huge and tunable bandgap in bilayer graphene by applying a moderately low bias. Our model can be extended to systems composed of decoupled graphene multilayers as well as non-graphene systems, opening a new realm of quantum-capacitively coupled materials.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | STATES; twisted bilayer graphene; double twisted bilayer graphene; quantum capacitance |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Feb 2024 11:02 |
| Last Modified: | 16 Feb 2024 11:02 |
| URI: | https://pred.uni-regensburg.de/id/eprint/58124 |
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