Universal Properties of the Ultra-Cold Fermi Gas

Understand

We present some general considerations on the properties of a two-component ultra-cold Fermi gas along the BEC-BCS crossover.

• It is shown that the interaction energy and the ground state energy can be written in terms of a single dimensionless function $h({\xi,\tau})$, where $\xi=-(k_Fa_s)^{-1}$ and $\tau=T/T_F$.
• The function $h(\xi,\tau)$ incorporates all the many-body physics and naturally occurs in other physical quantities as well.
• In particular, we show that the RF-spectroscopy shift $\bar{\d\o}(\xi,\tau)$ and the molecular fraction $f_c(\xi,\tau)$ in the closed channel can be expressed in terms of $h(\xi,\tau)$ and thus have identical temperature dependence.