Critical exponents at the unconventional disorder-driven transition in a Weyl semimetal

Abstract

Disordered noninteracting systems in sufficiently high dimensions have been predicted to display a non-Anderson disorder-driven transition that manifests itself in the critical behavior of the density of states and other physical observables. Recently, the critical properties of this transition have been extensively studied for the specific case of Weyl semimetals by means of numerical and renormalisation-group approaches. Despite this, the values of the critical exponents at such a transition in a Weyl semimetal are currently under debate. We present an independent calculation of the critical exponents using a two-loop renormalization-group approach for Weyl fermions in $2\ensuremath{-}\ensuremath{\varepsilon}$ dimensions and resolve controversies currently existing in the literature.