Feshbach resonance in dense ultracold Fermi gases

R. Combescot (1)

1 LPS - Laboratoire de Physique Statistique de l'ENS

We propose a coherent framework allowing to deal with many-body effects in dense ultracold Fermi gases in the presence of a Feshbach resonance. We show that the simple effect of Pauli exclusion induces a strong modification of the basic scattering properties, leading in particular to an energy dependence of the effective scattering length on the scale of the chemical potential. This results in a smearing of the Feshbach resonance and provides a natural explanation for recent experimental findings.

Domaines: Matière Molle [cond-mat.soft]; Mécanique statistique [cond-mat.stat-mech]

R. Combescot. Feshbach resonance in dense ultracold Fermi gases. Physical Review Letters, 2003, 91, pp.120401. ⟨10.1103/PhysRevLett.91.120401⟩. ⟨hal-00007762⟩