Thermodynamic properties and phase transition of strongly interacting two-component Fermi gases

TL;DR

This paper models the thermodynamic behavior and phase transition of strongly interacting two-component Fermi gases, focusing on dimer formation and comparing results with recent experimental data.

Contribution

It introduces a simple theoretical model considering fermionic atom pairs with divergent scattering length to analyze phase transition and thermodynamic properties.

Findings

Transition temperature for dimeric gas formation is determined.

The model's predictions align with experimental observations of condensate fraction and heat capacity.

The role of dimers in collective excitations is elucidated.

Abstract

The thermodynamic properties of two-component Fermi gases with divergent scattering length is investigated and the transition temperature for the emergence of a stable dimeric gas is obtained by a simple theoretical model where the unique property of the dimers (i.e. fermionic atom pairs) with divergent scattering length is considered. Below the transition temperature, through the investigation of the overall entropy for the mixture gas of fermionic atoms and dimers, we calculate the relation between the energy and temperature of the system. In the limit of zero temperature, based on the chemical equilibrium condition, the fraction of the dimers is investigated and the role of the dimers in the collective excitations of the system is also discussed. It is found that our theoretical results agree with the condensate fraction, collective excitations, transition temperature and heat capacity investigated by the recent experiments about the strongly interacting two-component Fermi gases.