Disorder and spin imbalance induced exotic phases in weakly coupled s wave superconductors

Abstract

The first part of our work deals with a smooth crossover from a Bardeen Cooper Schrieffer BCS phase comprising of largely overlapping pairs to a Bose superfluid BEC with short ranged tightly bound pairs induced by a random onsite disorder potential as opposed to tuning the interparticle attraction which is largely seen in literature At small disorder concentration Anderson theorem is known to be valid and in the large disorder regime an insulating phase is favoured We have convincingly