High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures

Details High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures

2003-11-11

arxiv.org/abs/cond-mat/0311248v3

Phys. Rev. Lett. 93, 090406 (2004)

Physics

Condensed Matter

4 pages, 2 figures, final version

Scientific paper

10.1103/PhysRevLett.93.090406

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 fermion-fermion coupling is always {\it attractive} if the boson-boson on site interaction is repulsive, and predict the existence of an enhanced BEC--BCS crossover as the strength of the lattice potential is varied. We show that for direct on-site fermion-fermion {\it repulsion}, the induced attraction can give rise to superfluidity via s-wave pairing, at striking variance with the case of pure systems of fermionic atoms with direct repulsive interactions.

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