The Gor'kov and Melik‐Barkhudarov Correction to an Imbalanced Fermi Gas in the Presence of Impurities

Abstract

AbstractThe effects of induced interactions are calculated in both clean and dirty situations, for balanced and imbalanced Fermi gases. The effects of nonmagnetic impurities on the induced interactions corrections to the transition temperature in the case of a balanced gas, and to the tricritical point in the case of an imbalanced Fermi gas at unitarity are investigated. It is found that impurities act in detriment of the induced interactions, or particle–hole fluctuations, for the transition temperature and the tricritical point. For large impurity parameter, the particle–hole fluctuations are strongly suppressed. The Chandrasekhar–Clogston limit of an imbalanced Fermi gas at unitarity considering the effects of the induced interactions, both in the pure and impurity regimes have also been found.