• Editors' Suggestion

Fabry-Pérot Interference in Gapped Bilayer Graphene with Broken Anti-Klein Tunneling

Anastasia Varlet, Ming-Hao Liu (劉明豪), Viktor Krueckl, Dominik Bischoff, Pauline Simonet, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Klaus Ensslin, and Thomas Ihn
Phys. Rev. Lett. 113, 116601 – Published 8 September 2014
PDFHTMLExport Citation

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 1μm-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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 13 June 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.116601

© 2014 American Physical Society

Authors & Affiliations

Anastasia Varlet1,*, Ming-Hao Liu (劉明豪)2, Viktor Krueckl2, Dominik Bischoff1, Pauline Simonet1, Kenji Watanabe3, Takashi Taniguchi3, Klaus Richter2, Klaus Ensslin1, and Thomas Ihn1

  • 1Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland
  • 2Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 3Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

  • *varleta@phys.ethz.ch

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 113, Iss. 11 — 12 September 2014

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Letters

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×