1306.4023 (Vieri Mastropietro)

Universality, exponents and anomaly cancellation in disordered Dirac
fermions    [PDF]

Vieri Mastropietro

Disordered 2D chiral fermions provide an effective description of several materials including graphene and topological insulators. While previous analysis considered delta correlated disorder and no ultraviolet cut-offs, we consider here the effect of short range correlated disorder and the presence of a momentum cut-off, providing a more realistic description of condensed matter models. We show that the density of states is anomalous with a critical exponent function of the disorder and that conductivity is universal only when the ultraviolet cut-off is removed, as consequence of the supersymmetric cancellation of the anomalies.

View original: http://arxiv.org/abs/1306.4023