%0 Journal Article
%T Turning the BEC-BCS crossover into a transition by radiation
%A Y. Lemonik
%A I. L. Aleiner
%A B. L. Altshuler
%J Physics
%D 2015
%I arXiv
%X We show that the Bardeen-Cooper-Schrieffer state (BCS) and the Bose-Einstein condensation (BEC) sides of the BCS-BEC crossover can be rigorously distinguished from each other by the extrema of the spectrum of the fermionic excitations. Moreover, we demonstrate that this formal distinction is realized as a non-equilibrium phase transition under radio frequency radiation. The BEC phase remains translationally invariant, whereas the BCS phase transforms into the supersolid phase. For a two-dimensional system this effect occurs at arbitrary small amplitude of the radiation field.
%U http://arxiv.org/abs/1505.04820v1