Resonant superfluidity in the Rabi-coupled spin-dependent Fermi-Hubbard model

Abstract

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.

11 pages, 6 figures

References in corpus (15)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Theory of ultracold Fermi gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Critical velocity for superfluid flow across the BEC-BCS crossover
• Many-body Landau-Zener dynamics in coupled 1D Bose liquids
• Interaction-controlled transport of an ultracold Fermi gas
• Fulde-Ferrell-Larkin-Ovchinnikov superfluidity in one-dimensional optical lattices
• Density-Matrix Renormalization Group Study of Trapped Imbalanced Fermi Condensates
• Goldstone mode and pair-breaking excitations in atomic Fermi superfluids
• Ground-state properties of hard-core bosons confined on one-dimensional optical lattices
• Higgs mode in a strongly interacting fermionic superfluid
• The FFLO state in the one-dimensional attractive Hubbard model and its fingerprint in the spatial noise correlations
• The critical velocity in the BEC-BCS crossover
• Spin-1/2 fermions on spin-dependent optical lattices
• Quantum phase diagram of fermion mixtures with population imbalance in one-dimensional optical lattices