Linear response of a superfluid Fermi gas inside its pair-breaking continuum.

Abstract:

:We study the signatures of the collective modes of a superfluid Fermi gas in its linear response functions for the order-parameter and density fluctuations in the Random Phase Approximation (RPA). We show that a resonance associated to the Popov-Andrianov (or sometimes "Higgs") mode is visible inside the pair-breaking continuum at all values of the wavevector q, not only in the (order-parameter) modulus-modulus response function but also in the modulus-density and density-density responses. At nonzero temperature, the resonance survives in the presence of thermally broken pairs even until the vicinity of the critical temperature Tc, and coexists with both the Anderson-Bogoliubov modes at temperatures comparable to the gap Δ and with the low-velocity phononic mode predicted by RPA near Tc. The existence of a Popov-Andrianov-"Higgs" resonance is thus a robust, generic feature of the high-energy phenomenology of pair-condensed Fermi gases, and should be accessible to state-of-the-art cold atom experiments.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kurkjian H,Tempere J,Klimin SN

doi

10.1038/s41598-020-65371-9

subject

Has Abstract

pub_date

2020-07-14 00:00:00

pages

11591

issue

1

issn

2045-2322

pii

10.1038/s41598-020-65371-9

journal_volume

10

pub_type

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