Universality of parametric spectral correlations: Local versus extended perturbing potentials
Universality of parametric spectral correlations: Local versus extended perturbing potentials
We explore the influence of an arbitrary external potential perturbation V on the spectral properties of a weakly disordered conductor. In the framework of a statistical field theory of a nonlinear sigma-model type we find, depending on the range and the profile of the external perturbation, two qualitatively different universal …