Released momentum distribution of a Fermi gas in the BCS-BEC crossover

TL;DR

This paper develops a mean-field theory to study the non-equilibrium momentum distribution and energy of a Fermi gas during the BCS-BEC crossover after a rapid change in interaction strength, comparing theory with experiments.

Contribution

It introduces a time-dependent mean-field approach to analyze the dynamics of a Fermi gas during the BCS-BEC crossover after a fast magnetic-field ramp.

Findings

The theory predicts the momentum distribution evolution during the ramp.

Comparison shows good agreement with experimental measurements.

Provides insights into non-equilibrium dynamics of ultracold Fermi gases.

Abstract

We develop a time-dependent mean-field theory to investigate the released momentum distribution and the released energy of an ultracold Fermi gas in the BCS-BEC crossover after the scattering length has been set to zero by a fast magnetic-field ramp. For a homogeneous gas we analyze the non-equilibrium dynamics of the system as a function of the interaction strength and of the ramp speed. For a trapped gas the theoretical predictions are compared with experimental results.