Metastable superfluidity of repulsive fermionic atoms in optical lattices.

  title={Metastable superfluidity of repulsive fermionic atoms in optical lattices.},
  author={A. Rosch and D. Rasch and B. Binz and M. Vojta},
  journal={Physical review letters},
  volume={101 26},
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… Expand

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