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

被引:11
作者
Combescot, R [1 ]
机构
[1] Ecole Normale Super, Phys Stat Lab, F-75231 Paris 05, France
来源
NEW JOURNAL OF PHYSICS | 2003年 / 5卷
关键词
D O I
10.1088/1367-2630/5/1/386
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We consider a dense ultracold Fermi gas in the presence of a Feshbach resonance. We investigate how the threshold 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 the order of the width of the Feshbach resonance. This is in agreement with very recent experimental findings.
引用
收藏
页码:86.1 / 86.6
页数:6
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