Effect of resonances on the transport properties of two-dimensional disordered systems

Abstract

We study both analytically and numerically how the electronic structure and the transport properties of a two-dimensional disordered system are modified in the presence of resonances. The energy dependence of the density of states and the localization length at different resonance energies and strengths of coupling between resonances and random states are determined. The results show, that at energy equals to the resonance energy there is an enhancement in the density of states. In contrast, the localization length remains unaffected from the presence of the resonances and is similar to the one of the standard Anderson model. Finally, we calculate the diffusion constant as a function of energy and we reveal interesting analogies with experimental results on light scattering in the presence of Mie resonances.