Fermionic superfluidity and spontaneous superflows in optical lattices

Details Fermionic superfluidity and spontaneous superflows in optical lattices Fermionic superfluidity and spontaneous superflows in optical lattices

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12b3032y&link_type=abstract

New Journal of Physics, Volume 12, Issue 2, pp. 023032 (2010).

Physics

Scientific paper

We studied the superfluidity of strongly repulsive fermionic atoms in optical lattices. Atoms are paired through a correlated tunneling mechanism, which induces superfluidity when repulsive nearest-neighbor interactions are included in the Hubbard model. This paired superfluid is a metastable state, which persists for a long time as the pair-broken process is severely suppressed. The mean-field phase diagram and low-energy excitations are investigated in a square lattice system. Intriguingly, spontaneous superflows may appear in the ground state of a triangular optical lattice system due to antiferromagnetic frustration.

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