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

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 Added by Anna Korolyuk
 Publication date 2011
  fields Physics
and research's language is English




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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.



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