Superfluidity of two-component fermions at the vicinity of orbital Feshbach resonance

As a test bed for understanding two-band superconductors, we study the superfluidity of two-component ultra-cold fermions in the presence of orbital Feshbach resonance. Based on a mean-field theory, we develop a theoretical approach and derive analytical expressions for both zero and finite temperature superfluid parameters. We present these superfluid parameters as a function of interaction strength between two fermions. These novel analytical results will serve as guiding schemes for current cold-atom experiments. Further, our results will have an impact on understanding two-band superconductors such as MgB₂.