Scaling approach to tight-binding transport in realistic graphene devices: The case of transverse magnetic focusing

Research output: Contribution to journalArticle

  • Authors:
  • M. Beconcini
  • S. Valentini
  • R. Krishna Kumar
  • G. H. Auton
  • A. K. Geim
  • And 3 others
  • External authors:
  • L. A. Ponomarenko
  • M. Polini
  • F. Taddei

Abstract

Ultraclean graphene sheets encapsulated between hexagonal boron nitride crystals host two-dimensional electron systems in which low-temperature transport is solely limited by the sample size. We revisit the theoretical problem of carrying out microscopic calculations of nonlocal ballistic transport in such micron-scale devices. By employing the Landauer-Büttiker scattering theory, we propose a scaling approach to tight-binding nonlocal transport in realistic graphene devices. We test our numerical method against experimental data on transverse magnetic focusing (TMF), a textbook example of nonlocal ballistic transport in the presence of a transverse magnetic field. This comparison enables a clear physical interpretation of all the observed features of the TMF signal, including its oscillating sign.

Bibliographical metadata

Original languageEnglish
Article number115441
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume94
Issue number11
DOIs
StatePublished - 30 Sep 2016