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

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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.
Original languageEnglish
Article number033623
Pages (from-to)1-12
Number of pages12
JournalPhysical Review A
Volume84
Issue number3
DOIs
Publication statusPublished - 19 Sep 2011
MoE publication typeA1 Journal article-refereed

Keywords

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

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