Fabry-pérot interference in gapped bilayer graphene with broken anti-klein tunneling

Anastasia Varlet, Ming Hao Liu, Viktor Krueckl, Dominik Bischoff, Pauline Simonet, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Klaus Ensslin, Thomas Ihn

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Abstract

We report the experimental observation of Fabry-Pérot 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-μm-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-Pérot oscillations regardless of the magnetic field, in sharp contrast with single-layer graphene.

Original languageEnglish
Article number116601
JournalPhysical review letters
Volume113
Issue number11
DOIs
Publication statusPublished - 2014 Sep 12

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Varlet, A., Liu, M. H., Krueckl, V., Bischoff, D., Simonet, P., Watanabe, K., Taniguchi, T., Richter, K., Ensslin, K., & Ihn, T. (2014). Fabry-pérot interference in gapped bilayer graphene with broken anti-klein tunneling. Physical review letters, 113(11), [116601]. https://doi.org/10.1103/PhysRevLett.113.116601