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Exciting the Higgs Mode in a Strongly Interacting Fermi Gas by Interaction Modulation.

Andreas Kell1, Moritz Breyer1, Daniel Eberz1

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Researchers studied the Higgs mode in a strongly interacting Fermi gas, observing its resonance frequency and line width. The findings show unexpected temperature independence, offering insights into quantum gas behavior.

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Area of Science:

  • Quantum Gas Physics
  • Condensed Matter Physics

Background:

  • Superfluidity in Fermi gases exhibits a crossover from fermionic to bosonic behavior.
  • The Higgs mode, a collective excitation, is a key feature in gapped systems like superfluids.

Purpose of the Study:

  • To investigate the Higgs mode in a strongly interacting Fermi gas within the fermionic-bosonic crossover regime.
  • To analyze the resonance frequency and line width of the parametrically excited Higgs mode.
  • To determine the dependence of these properties on interaction strength and temperature.

Main Methods:

  • Utilizing a strongly interacting Fermi gas.
  • Periodically modulating the interaction strength to parametrically excite the Higgs mode.
  • Measuring the resonance frequency and line width of the Higgs mode.

Main Results:

  • The resonance frequency at low temperatures aligns with theoretical predictions based on the pairing gap.
  • Both the resonance frequency and line width show minimal variation with temperature.
  • This temperature independence is unexpected theoretically but consistent with some recent findings.

Conclusions:

  • The study provides experimental data on the Higgs mode in a unique quantum gas regime.
  • The observed temperature independence challenges theoretical expectations, suggesting further investigation is needed.
  • This research contributes to understanding collective excitations in strongly correlated quantum systems.