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

Journal Article · Thu Sep 15 00:00:00 EDT 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.033623· OSTI ID:22068768

Korolyuk, A; Kinnunen, J J ^[1]; Toermae, P ^[1]

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1. Department of Applied Physics, School of Science, Aalto University, P.O. Box 15100, FIN-00076 Aalto (Finland)

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.

• OSTI ID: 22068768
• Journal Information: Physical Review. A, Vol. 84, Issue 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
DAMPING
DENSITY
EXCITATION
FERMI GAS
GASES
INTERACTIONS
OSCILLATION MODES
RANDOM PHASE APPROXIMATION
TRAPPING