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 language | English |
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Article number | 033623 |
Pages (from-to) | 1-12 |
Number of pages | 12 |
Journal | Physical Review A |
Volume | 84 |
Issue number | 3 |
DOIs | |
Publication status | Published - 19 Sept 2011 |
MoE publication type | A1 Journal article-refereed |
Keywords
- collective mode
- density response
- random phase approximation
- ultracold Fermi gas