Decay and revival of a transient trapped Fermi condensate

TL;DR

This paper investigates how a strongly-interacting two-component Fermi condensate responds to sudden changes in interaction strength, revealing excitation of collective modes and dynamics comparable to quasiparticle relaxation times.

Contribution

It provides both experimental and theoretical insights into the transient dynamics and collective excitations of a Fermi condensate after a quench in interaction strength.

Findings

Quench excites the monopole mode of the trap.

Initial condensate property changes occur on a timescale similar to quasiparticle relaxation.

The study combines experimental data with theoretical modeling.

Abstract

We study experimentally and theoretically the response of a two-component Fermi condensate in the strongly-interacting regime to a quench of the interaction strength. The quench is realized using a radio-frequency $\pi$-pulse to a third internal level with a different interaction strength. We find that the quench excites the monopole mode of the trap in the hydrodynamic regime and that an initial change of the condensate properties takes place on a time scale comparable or even larger than the quasi-particle relaxation time.