Phys. Rev. Lett. 101, 265301 (2008) [4 pages]Metastable Superfluidity of Repulsive Fermionic Atoms in Optical LatticesReceived 5 September 2008; revised 3 November 2008; published 29 December 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.265301
DOI:
10.1103/PhysRevLett.101.265301
PACS:
67.85.−d, 03.75.Ss, 71.10.Fd
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