Wurm, J. and Wimmer, M. and Baranger, H. U. and Richter, K. (2010) Graphene rings in magnetic fields: Aharonov-Bohm effect and valley splitting. SEMICONDUCTOR SCIENCE AND TECHNOLOGY, 25 (3): 034003. ISSN 0268-1242,
Full text not available from this repository. (Request a copy)Abstract
We study the conductance of mesoscopic graphene rings in the presence of a perpendicular magnetic field by means of numerical calculations based on a tight-binding model. First, we consider the magnetoconductance of such rings and observe the Aharonov-Bohm effect. We investigate different regimes of the magnetic flux up to the quantum Hall regime, where the Aharonov-Bohm oscillations are suppressed. Results for both clean (ballistic) and disordered (diffusive) rings are presented. Second, we study rings with smooth mass boundary that are weakly coupled to leads. We show that the valley degeneracy of the eigenstates in closed graphene rings can be lifted by a small magnetic flux, and that this lifting can be observed in the transport properties of the system.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Aug 2020 11:28 |
| Last Modified: | 03 Aug 2020 11:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24986 |
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