Disorder and superconductivity: a new phase of bi-particle localized states
Laboratoire de Physique Quantique (UMR 5626, CNRS) , Université Paul Sabatier, 31062 Toulouse Cedex 4, France
Corresponding author: a email@example.com
Published online: 15 December 2001
We study the two-dimensional, disordered, attractive Hubbard model by the projector quantum Monte Carlo method and Bogoliubov-de Gennes mean-field theory. Our results for the ground state show the appearance of a new phase with charge localization in the metallic regime of the non-interacting model. Contrary to the common lore, we demonstrate that mean-field theory fails to predict this phase and is unable to describe the correct physical picture in this regime.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001