Dual-gated bilayer graphene with layer mismatch

Hasan M. Abdullah, Abderrahim El Mouhafid, Gokaran Shukla, Udo Schwingenschlogl*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

One of the key features of graphene is the chirality of the electrons originating from the lattice symmetry. Conservation of the chirality leads to Klein and anti-Klein tunneling in graphene and AB-stacked bilayer graphene, respectively. Introduction of an external perturbation (electric field, strain, twist, layer mismatch, etc.) can change the chirality and therefore significantly modify the quantum transport. We explore the tunneling in AB-stacked bilayer graphene in the presence of an in-plane pseudomagnetic field (IPMF) and an out-of-plane electric field (OEF). Employing a low-energy effective model, we study the energy spectrum, chirality, and wave functions to evaluate the transmission and conductance in an n-p-n junction. We demonstrate that the IPMF and OEF together induce an indirect band gap. The IMPF induces a layer polarization of propagating states (enhanced in the presence of the OEF) with the layer symmetry broken locally in a single valley but preserved globally. While the effect of the IPMF is negligible in the ballistic transport regime at the neutrality point, the OEF suppresses the ballistic transport (partially recovered in the presence of the IPMF). In the diffusive transport regime, the IPMF amplifies the Fabry-Pérot resonances, thus modifying the conductance, while the OEF induces an out-of-plane chirality component that enables Klein resonances.

Original languageEnglish (US)
Article number155434
JournalPhysical Review B
Volume108
Issue number15
DOIs
StatePublished - Oct 15 2023

Bibliographical note

Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by King Abdullah University of Science and Technology.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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