Density response of a trapped Fermi gas: a crossover from the pair vibration mode to the Goldstone mode

Loading...
Thumbnail Image

Access rights

openAccess

URL

Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2011-09-19

Major/Subject

Mcode

Degree programme

Language

en

Pages

12
1-12

Series

PHYSICAL REVIEW A, Volume 84, issue 3

Abstract

We consider the density response of a trapped two-component Fermi gas. Combining the Bogoliubov-deGennes method with the random phase approximation allows the study of both collective and single-particle excitations. Calculating the density response across a wide range of interactions, we observe a crossover from a weakly interacting pair vibration mode to a strongly interacting Goldstone mode. The crossover is associated with a depressed collective mode frequency and an increased damping rate, in agreement with density response experiments performed in strongly interacting atomic gases.

Description

Keywords

collective mode, density response, random phase approximation, ultracold Fermi gas

Other note

Citation

Korolyuk , A , Kinnunen , J J & Törmä , P 2011 , ' Density response of a trapped Fermi gas: a crossover from the pair vibration mode to the Goldstone mode ' , Physical Review A , vol. 84 , no. 3 , 033623 , pp. 1-12 . https://doi.org/10.1103/PhysRevA.84.033623