Collective modes in a uniform Fermi gas with Feshbach resonances

Journal Article · Tue May 15 00:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.053608· OSTI ID:20982568

Huang, Beibing; Wan, Shaolong ^[1]

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1. Institute for Theoretical Physics and Department of Modern Physics, University of Science and Technology of China, Hefei, 230026 (China)

The collective modes in a uniform fermionic atomic gas with Feshbach resonance are investigated with the path integral method in the frame of a fermion-boson model Hamiltonian. We mainly concentrated on the long-wavelength and low-frequency limits at T=0 K and got an analytical expression for the collective modes across the whole BCS-Bose-Einstein condensate (BEC) crossover. We completely recover the Anderson-Bogoliubov modes in the BCS limit and the Bogoliubov modes of the bosonic systems in the BEC limit. The numerical results show that there exists a continuous interpolation for sound velocity between BCS and BEC limits.

• OSTI ID: 20982568
• Journal Information: Physical Review. A, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevA.75.053608; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BBGKY EQUATION
BCS THEORY
BOSE-EINSTEIN CONDENSATION
BOSONS
FERMI GAS
FERMIONS
HAMILTONIANS
INTERPOLATION
RESONANCE
SOUND WAVES
TEMPERATURE ZERO K
WAVELENGTHS