Unitary Fermi superfluid near the critical temperature: thermodynamics and sound modes from elementary excitations
arXiv:2206.03924 · doi:10.1103/PhysRevA.105.063329
Abstract
We compare recent experimental results [Science 375, 528 (2022)] of the superfluid unitary Fermi gas near the critical temperature with a thermodynamic model based on elementary excitations of the system. We find very good agreement between experimental data and our theory for several quantities such as first sound, second sound, and superfluid fraction. We also show that mode mixing between first and second sound occurs. Finally, we characterize the response amplitude to a density perturbation: close to the critical temperature both first and second sound can be excited through a density perturbation, whereas at lower temperatures only the first sound mode exhibits a significant response.
arXiv comment7 pages, 2 figures, accepted for publication in Physical Review A
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