Shift of the molecular bound state threshold in dense ultracold Fermi gases with Feshbach resonance

Details Shift of the molecular bound state threshold in dense ultracold Fermi gases with Feshbach resonance Shift of the molecular bound state threshold in dense ultracold Fermi gases with Feshbach resonance

2003-04-04

arxiv.org/abs/cond-mat/0304119v2

New Journal of Physics,5,86(2003)

Physics

Condensed Matter

Soft Condensed Matter

one reference added

Scientific paper

10.1088/1367-2630/5/1/386

We consider a dense ultracold Fermi gas in the presence of a Feshbach resonance. We investigate how the treshold for bound state formation, which is just at the Feshbach resonance for a dilute gas, is modified due to the presence of the Fermi sea. We make use of a preceding framework of handling this many-body problem. We restrict ourselves to the simple case where the chemical potential $ \mu $ is negative, which allows us to cover in particular the classical limit where the effect is seen to disappear. We show that, within a simple approach where basically only the effect of Pauli exclusion is included, the Fermi sea produces a large shift of the threshold, which is of order of the width of the Feshbach resonance. This is in agreement with very recent experimental findings.

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