Eur. Phys. J. B (2014) 87: 142
https://doi.org/10.1140/epjb/e2014-41073-x

Regular Article

Scaling behavior of disordered lattice fermions in two dimensions

Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

^a e-mail: ziegler@physik.uni-augsburg.de

Received: 11 December 2013
Received in final form: 13 April 2014
Published online: 23 June 2014

Abstract

We propose a lattice model for Dirac fermions which allows us to break the degeneracy of the node structure. In the presence of a random gap we analyze the scaling behavior of the localization length as a function of the system width within a numerical transfer-matrix approach. Depending on the strength of the randomness, there are different scaling regimes for weak, intermediate and strong disorder. These regimes are separated by transitions that are characterized by one-parameter scaling.