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Beyond mean-field corrections to the quasiparticle spectrum of superfluid fermi gases

Tijdschriftbijdrage - e-publicatie

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.
Tijdschrift: Physical review letters
ISSN: 0031-9007
Volume: 124
Pagina's: 1 - 6
Jaar van publicatie:2020
Trefwoorden:A1 Journal article
BOF-keylabel:ja
BOF-publication weight:6
CSS-citation score:1
Authors from:Higher Education
Toegankelijkheid:Open