Low energy collective excitations in a superfluid trapped Fermi gas

TL;DR

This paper investigates low energy collective excitations in a trapped superfluid Fermi gas, showing these modes are linked to density fluctuations and could serve as experimental evidence of superfluidity.

Contribution

It provides a theoretical analysis of the eigenfrequencies of collective modes in a superfluid Fermi gas, highlighting their relation to trap frequency and density fluctuations.

Findings

Eigenfrequencies are of the order of the trap frequency.

Modes manifest as density fluctuation eigenmodes.

Potential experimental signature of superfluid phase.

Abstract

We study low energy collective excitations in a trapped superfluid Fermi gas, that describe slow variations of the phase of the superfluid order parameter. Well below the critical temperature the corresponding eigenfrequencies turn out to be of the order of the trap frequency, and these modes manifest themselves as the eigenmodes of the density fluctuations of the gas sample. The latter could provide an experimental evidence of the presence of the superfluid phase.