Spin-1/2 fermions: crossover from weak to strong attractive interaction

Details Spin-1/2 fermions: crossover from weak to strong attractive interaction Spin-1/2 fermions: crossover from weak to strong attractive interaction

2004-11-03

arxiv.org/abs/cond-mat/0411072v1

Laser Physics 15, No. 4, 650-655 (2005)

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures, conference proceedings LASPHYS'04 (Trieste)

Scientific paper

The formation and dissociation of bosonic molecules in an optical lattice, formed by spin-1/2 fermionic atoms, is considered in the presence of an attractive nearest-neighbor interaction. A mean-field approximation reveals three different phases at zero temperature: an empty, a condensate and a Mott-insulating phase. The density of fermionic atoms and the density of bosonic molecules indicate a characteristic behavior with respect to the interaction strength that distinguishes between a dilute and a dense regime. In particular, the attractive interaction favors the formation of molecules in the dilute regime and the dissociation of atoms in the dense regime.

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