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

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

2011-06-02

arxiv.org/abs/1106.0430v2

Phys. Rev. A 84, 033623 (2011)

Physics

Condensed Matter

Quantum Gases

14 pages, 8 figures

Scientific paper

10.1103/PhysRevA.84.033623

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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