Publication
Title
Effects of quantum fluctuations on the low-energy collective modes of two-dimensional superfluid Fermi gases from the BCS to the Bose limit
Author
Abstract
We investigate the effects of quantum fluctuations on the low-energy collective modes of twodimensional (2D) s-wave Fermi superfluids from the BCS to the Bose limit. We compare our results to recent Bragg scattering experiments in 2D box potentials, with very good agreement. We show that quantum fluctuations in the phase and modulus of the pairing order parameter are absolutely necessary to give physically acceptable chemical potential and dispersion relation of the low-energy collective mode throughout the BCS to Bose evolution. Furthermore, we demonstrate that the dispersion of the collective modes change from concave to convex as interactions are tuned from the BCS to the Bose regime, and never crosses the two-particle continuum, because arbitrarily small attractive interactions produce bound states in two dimensions.
Language
English
Source (journal)
Physical review letters. - New York, N.Y., 1958, currens
Publication
New York, N.Y. : American Physical Society , 2023
ISSN
0031-9007 [print]
1079-7114 [online]
DOI
10.1103/PHYSREVLETT.131.113001
Volume/pages
131 :11 (2023) , p. 1-7
Article Reference
113001
ISI
001155760800004
Pubmed ID
37774271
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identifier
Creation 04.03.2024
Last edited 15.03.2024
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