Metastable Superfluidity of Repulsive Fermionic Atoms in Optical Lattices

Achim Rosch, David Rasch, Benedikt Binz, and Matthias Vojta
Phys. Rev. Lett. 101, 265301 – Published 29 December 2008

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.

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  • Received 5 September 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.265301

©2008 American Physical Society

Authors & Affiliations

Achim Rosch, David Rasch, Benedikt Binz, and Matthias Vojta

  • Institute of Theoretical Physics, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany

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Issue

Vol. 101, Iss. 26 — 31 December 2008

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