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Disordered doubleWeyl node: Comparison of transport and density of states calculations
Stockholm University, Faculty of Science, Department of Physics. Freie Universit├Ąt Berlin, Germany.
Number of Authors: 4
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 11, 115104Article in journal (Refereed) Published
Abstract [en]

Double Weyl nodes are topologically protected band crossing points which carry chiral charge +/- 2. They are stabilized by C-4 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.

Place, publisher, year, edition, pages
2017. Vol. 95, no 11, 115104
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-142474DOI: 10.1103/PhysRevB.95.115104ISI: 000396004000004OAI: oai:DiVA.org:su-142474DiVA: diva2:1096207
Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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