Graphene pn junction in a quantizing magnetic field: Conductance at intermediate disorder strength

Christian Fräßdorf, Luka Trifunovic, Nils Bogdanoff, and Piet W. Brouwer
Phys. Rev. B 94, 195439 – Published 28 November 2016

Abstract

In a graphene pn junction at high magnetic field, unidirectional “snake states” are formed at the pn interface. In a clean pn junction, each snake state exists in one of the valleys of the graphene band structure, and the conductance of the junction as a whole is determined by microscopic details of the coupling between the snake states at the pn interface and quantum Hall edge states at the sample boundaries [Tworzydło et al., Phys. Rev. B 76, 035411 (2007)]. Disorder mixes and couples the snake states. We here report a calculation of the full conductance distribution in the crossover between the clean limit and the strong-disorder limit, in which the conductance distribution is given by random matrix theory [Abanin and Levitov, Science 317, 641 (2007)]. Our calculation involves an exact solution of the relevant scaling equation for the scattering matrix, and the results are formulated in terms of parameters describing the microscopic disorder potential in bulk graphene.

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  • Received 26 July 2016
  • Revised 2 November 2016

DOI:https://doi.org/10.1103/PhysRevB.94.195439

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christian Fräßdorf, Luka Trifunovic, Nils Bogdanoff, and Piet W. Brouwer

  • Dahlem Center for Complex Quantum Systems and Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany

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Issue

Vol. 94, Iss. 19 — 15 November 2016

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