Disordered double Weyl node: Comparison of transport and density of states calculations

Björn Sbierski, Maximilian Trescher, Emil J. Bergholtz, and Piet W. Brouwer
Phys. Rev. B 95, 115104 – Published 1 March 2017

Abstract

Double Weyl nodes are topologically protected band crossing points which carry chiral charge ±2. They are stabilized by C4 point-group symmetry and are predicted to occur in SrSi2 or HgCr2Se4. We study their stability and physical properties in the presence of a disorder potential. We investigate the density of states and the quantum transport properties at the nodal point. We find that, in contrast to their counterparts with unit chiral charge, double Weyl nodes are unstable to any finite amount of disorder and give rise to a diffusive phase, in agreement with the predictions of Goswami and Nevidomskyy [Phys. Rev. B 92, 214504 (2015)] and Bera, Sau, and Roy [Phys. Rev. B 93, 201302 (2016)]. However, for finite system sizes a crossover between pseudodiffusive and diffusive quantum transport can be observed.

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  • Received 23 December 2015
  • Revised 9 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.115104

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Björn Sbierski1,*, Maximilian Trescher1, Emil J. Bergholtz1,2, and Piet W. Brouwer1

  • 1Dahlem Center for Complex Quantum Systems and Institut für Theoretische Physik, Freie Universität Berlin, D-14195 Berlin, Germany
  • 2Department of Physics, Stockholm University, SE-106 91 Stockholm, Sweden

  • *b.sbierski@fu-berlin.de

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Issue

Vol. 95, Iss. 11 — 15 March 2017

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