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Published on: March 30, 2017
Beyond Mean-Field Corrections to the Quasiparticle Spectrum of Superfluid Fermi Gases
Senne Van Loon1, Jacques Tempere1, Hadrien Kurkjian1
1TQC, Universiteit Antwerpen, Universiteitsplein 1, B-2610 Antwerpen, België.
Abstract:
We investigate the fermionic quasiparticle branch of superfluid Fermi gases in the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensation (BEC) crossover and calculate the quasiparticle lifetime and energy shift due to its coupling with the collective mode. The only close-to-resonance process that low-energy quasiparticles can undergo at zero temperature is the emission of a bosonic excitation from the phononic branch. Close to the minimum of the branch we find that the quasiparticles remain undamped, allowing us to compute corrections to experimentally relevant quantities such as the energy gap, location of the minimum, effective mass, and Landau critical velocity.
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