Varlet, Anastasia and Liu, Ming-Hao and Krueckl, Viktor and Bischoff, Dominik and Simonet, Pauline and Watanabe, Kenji and Taniguchi, Takashi and Richter, Klaus and Ensslin, Klaus and Ihn, Thomas (2014) Fabry-Perot Interference in Gapped Bilayer Graphene with Broken Anti-Klein Tunneling. PHYSICAL REVIEW LETTERS, 113 (11): 116601. ISSN 0031-9007, 1079-7114
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We report the experimental observation of Fabry-Perot interference in the conductance of a gate-defined cavity in a dual-gated bilayer graphene device. The high quality of the bilayer graphene flake, combined with the device's electrical robustness provided by the encapsulation between two hexagonal boron nitride layers, allows us to observe ballistic phase-coherent transport through a 1-mu m-long cavity. We confirm the origin of the observed interference pattern by comparing to tight-binding calculations accounting for the gate-tunable band gap. The good agreement between experiment and theory, free of tuning parameters, further verifies that a gap opens in our device. The gap is shown to destroy the perfect reflection for electrons traversing the barrier with normal incidence (anti-Klein tunneling). The broken anti-Klein tunneling implies that the Berry phase, which is found to vary with the gate voltages, is always involved in the Fabry-P rot oscillations regardless of the magnetic field, in sharp contrast with single-layer graphene.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BAND-STRUCTURE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Aug 2019 09:15 |
| Last Modified: | 14 Aug 2019 09:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9562 |
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