High-Temperature Atomic Superfluidity in Lattice Bose-Fermi Mixtures

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  • 11 November 2003
Abstract
We consider atomic Bose-Fermi mixtures in optical lattices and study the superfluidity of fermionic atoms due to s-wave pairing induced by boson-fermion interactions. We prove that the induced coupling is always attractive and predict the existence of an enhanced BEC--BCS crossover as the strength of the lattice potential is varied. We show that even in the instance of direct on-site fermion-fermion repulsion, the induced attraction can give rise to high-temperature superfluidity via s-wave pairing, at striking variance with the case of pure fermionic systems with direct repulsive interactions. This mechanism thus realizes an exact atomic analogue of electron pairing in crystal lattices.

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