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Updated: Dec 14, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Linear response of a superfluid Fermi gas inside its pair-breaking continuum
H Kurkjian1, J Tempere2, S N Klimin2
1TQC, Universiteit Antwerpen, Universiteitsplein 1, B-2610, Antwerp, Belgium. hadrien.kurkjian@gmail.com.
We found a robust Popov-Andrianov (Higgs) mode resonance in superfluid Fermi gases. This collective mode signature appears in various response functions and persists even at higher temperatures near the critical temperature.
Area of Science:
- Condensed matter physics
- Ultracold atomic gases
- Quantum fluids
Background:
- Superfluid Fermi gases exhibit complex collective modes.
- Understanding these modes is crucial for probing quantum phenomena.
- The Popov-Andrianov (Higgs) mode is a key excitation in such systems.
Purpose of the Study:
- To investigate the signatures of collective modes in superfluid Fermi gases.
- To analyze linear response functions for order-parameter and density fluctuations.
- To determine the observability of the Popov-Andrianov mode.
Main Methods:
- Utilizing the Random Phase Approximation (RPA).
- Calculating linear response functions, including modulus-modulus, modulus-density, and density-density.
- Examining behavior across various wavevectors and temperatures.
Main Results:
- A Popov-Andrianov (Higgs) mode resonance is identified within the pair-breaking continuum for all wavevectors.
- This resonance is present in multiple response functions, not just modulus-modulus.
- The resonance persists at nonzero temperatures, coexisting with other modes near the critical temperature.
Conclusions:
- The Popov-Andrianov-Higgs resonance is a robust and generic feature of pair-condensed Fermi gases.
- Its signatures are accessible through various linear response functions.
- This finding should be experimentally verifiable with current cold atom techniques.
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