Investigating dirty crossover through fidelity susceptibility and density of states
Ayan Khan, Saurabh Basu, B. Tanatar
We investigate the BCS–BEC crossover in an ultracold atomic gas in the presence of disorder. The disorder is incorporated in the mean-field formalism through Gaussian fluctuations. We observe evolution to an asymmetric line-shape of fidelity susceptibility (FS) as a function of interaction coupling with increasing disorder strength which may point to an impending quantum phase transition (QPT). The asymmetric line-shape is further analyzed using the statistical tools of skewness and kurtosis. We extend our analysis to density of states (DOS) for a better understanding of the crossover in the disordered environment.
arXiv:1401.7459•International Journal of Modern Physics B•Mar 18, 2014•2 citations