BCS-BEC crossover at t=0 Based on BCS-Leggett ground state BCS)=Tu+vs* ck) Self-consistently solve for chemical potential 2E g Ek IkEa l/kBCS-BEC crossover at T=0 ◼ Based on BCS-Leggett ground state ◼ Self-consistently solve for chemical potential ( )  + − +  = + k k k k k 0 , , BCS u v c c E g 1 2 1  = − k k          = − k k k E n  1