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

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.

Authors:
;  [1];  [1]
  1. Department of Applied Physics, School of Science, Aalto University, P.O. Box 15100, FIN-00076 Aalto (Finland)
Publication Date:
OSTI Identifier:
22068768
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 84; Journal Issue: 3; Other Information: (c) 2011 American Institute of Physics; Country of input: Syrian Arab Republic; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Korolyuk, A, Kinnunen, J J, Toermae, P, and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030. Density response of a trapped Fermi gas: A crossover from the pair vibration mode to the Goldstone mode. United States: N. p., 2011. Web. doi:10.1103/PHYSREVA.84.033623.
Korolyuk, A, Kinnunen, J J, Toermae, P, & Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030. Density response of a trapped Fermi gas: A crossover from the pair vibration mode to the Goldstone mode. United States. https://doi.org/10.1103/PHYSREVA.84.033623
Korolyuk, A, Kinnunen, J J, Toermae, P, and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030. 2011. "Density response of a trapped Fermi gas: A crossover from the pair vibration mode to the Goldstone mode". United States. https://doi.org/10.1103/PHYSREVA.84.033623.
@article{osti_22068768,
title = {Density response of a trapped Fermi gas: A crossover from the pair vibration mode to the Goldstone mode},
author = {Korolyuk, A and Kinnunen, J J and Toermae, P and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030},
abstractNote = {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.},
doi = {10.1103/PHYSREVA.84.033623},
url = {https://www.osti.gov/biblio/22068768}, journal = {Physical Review. A},
issn = {1050-2947},
number = 3,
volume = 84,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2011},
month = {Thu Sep 15 00:00:00 EDT 2011}
}