Number of closed-channel molecules in the BEC-BCS crossover

详细信息    查看全文

• 作者：F. Werner ; L. Tarruell and Y. Castin
• 关键词：PACS 03.75.Ss Degenerate Fermi gases ; 67.90.+z Other topics in quantum fluids and solids
• 刊名：The European Physical Journal B - Condensed Matter
• 出版年：2009
• 出版时间：April, 2009
• 年：2009
• 卷：68
• 期：3
• 页码：401-415
• 全文大小：426.6 KB

文摘

Using a two-channel model, we show that the number of closed-channel molecules in a two-component Fermi gas close to a Feshbach resonance is directly related to the derivative of the energy of the gas with respect to the inverse scattering length. We extract this quantity from the fixed-node Monte Carlo equation of state and we compare to the number of closed-channel molecules measured in the Rice experiment with lithium [Partridge et al., Phys. Rev. Lett. 95, 020404 (2005)]. We also discuss the effect of a difference between the trapping potentials seen by a closed-channel molecule and by an open-channel pair of atoms in terms of an effective position-dependent scattering length.