Metastable superfluidity of repulsive fermionic atoms in optical lattices

Abstract

In the fermionic Hubbard model, doubly occupied states have an exponentially large lifetime for strong repulsive interactions U. We show that this property can be used to prepare a metastable s-wave superfluid state for fermionic atoms in optical lattices described by a large-U Hubbard model. When an initial band-insulating state is expanded, the doubly occupied sites Bose condense. A mapping to the ferromagnetic Heisenberg model in an external field allows for a reliable solution of the problem. Nearest-neighbor repulsion and pair hopping are important in stabilizing superfluidity.

4 pages, 3 figs; (v2) final version as published

References in corpus (3)

• Antiferromagnetic Order of Strongly Interacting Fermions in a Trap: Real-Space Dynamical Mean-Field Analysis
• Mott transition of fermionic atoms in a three-dimensional optical trap
• Quantum liquid of repulsively bound pairs of particles in a lattice

Cited by in corpus (3)

• Dynamical phase transition in correlated fermionic lattice systems
• Quantum distillation: dynamical generation of low-entropy states of strongly correlated fermions in an optical lattice
• Fulde-Ferrell-Larkin-Ovchinnikov phase in the presence of pair hopping interaction