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Tilted disordered Weyl semimetals
Stockholm University, Faculty of Science, Department of Physics. Freie Universität Berlin, Germany.
Number of Authors: 4
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 95, no 4, 1-8 p., 045139Article in journal (Refereed) Published
Abstract [en]

Although Lorentz invariance forbids the presence of a term that tilts the energy-momentum relation in the Weyl Hamiltonian, a tilted dispersion is not forbidden and, in fact, generic for condensed matter realizations of Weyl semimetals. We here investigate the combined effect of such a tilted Weyl dispersion and the presence of potential disorder. In particular, we address the influence of a tilt on the disorder-induced phase transition between a quasiballistic phase at weak disorder, in which the disorder is an irrelevant perturbation, and a diffusive phase at strong disorder. Our main result is that the presence of a tilt leads to a reduction of the critical disorder strength for this transition or, equivalently, that increasing the tilt at fixed disorder strength drives the system through the phase transition to the diffusive strong-disorder phase. Notably this obscures the tilt-induced Lifshitz transition to an overtilted type II Weyl phase at any finite disorder strength. Our results are supported by analytical calculations using the self-consistent Born approximation and numerical calculations of the density of states and of transport properties.

Place, publisher, year, edition, pages
2017. Vol. 95, no 4, 1-8 p., 045139
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-143489DOI: 10.1103/PhysRevB.95.045139ISI: 000400772100003OAI: oai:DiVA.org:su-143489DiVA: diva2:1103820
Available from: 2017-05-31 Created: 2017-05-31 Last updated: 2017-05-31Bibliographically approved

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