  We investigate the ground-state phase diagram of the one-dimensional
attractive Fermi-Hubbard model with spin-dependent hoppings and an on-site Rabi
coupling using the density matrix renormalization group method. In particular,
we show that even in the limit of one component being immobile the pair
superfluidity can be resonantly enhanced when the Rabi coupling is on the order
of the interaction strength just before the system starts to strongly polarize.
We derive an effective spin-1/2 XXZ model in order to understand the
ground-state properties in the strong attraction limit.
