Metastable superfluidity of repulsive fermionic atoms in optical lattices

Details Metastable superfluidity of repulsive fermionic atoms in optical lattices Metastable superfluidity of repulsive fermionic atoms in optical lattices

2008-09-03

arxiv.org/abs/0809.0505v2

Phys. Rev. Lett. 101, 265301 (2008)

Physics

Condensed Matter

Other Condensed Matter

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

Scientific paper

10.1103/PhysRevLett.101.265301

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.

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