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Updated: Jul 15, 2026
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Acoustic attenuation probe for Fermion superfluidity in ultracold-atom gases
Sergio Gaudio1, Bogdan Mihaila, Krastan B Blagoev
1Department of Physics, Boston College, Chestnut Hill, Massachusetts 02167, USA. sergio.gaudio@roma1.infn.it
Physical Review Letters
|May 16, 2007
Summary
Dilute gas Bose-Einstein condensates can probe fermionic superfluidity by measuring phonon mode damping. This method reveals BCS-like superfluidity, measures the superfluid gap, and estimates Cooper pair size.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Condensed Matter Physics
- Quantum Gases
Background:
- Dilute gas Bose-Einstein condensates (BECs) are utilized for cooling fermionic atoms in traps.
- BECs offer a potential avenue for investigating the superfluidity of these fermions.
Purpose of the Study:
- To demonstrate that BECs can probe the superfluidity of fermionic atoms.
- To establish a method for measuring the superfluid gap parameter and Cooper pair size.
- To predict observable features in damping rate measurements.
Main Methods:
- Measuring the damping rate of BEC-acoustic excitations (phonon modes).
- Analyzing the damping rate as a function of phonon momentum in the trap center.
- Investigating the BEC-BCS crossover regime.
Main Results:
- The damping rate of phonon modes provides an unambiguous signature of BCS-like superfluidity.
- The measurements yield a value for the superfluid gap parameter.
- An estimate of the Cooper pair size in the BEC-BCS crossover regime is obtained.
Conclusions:
- BECs serve as a powerful tool for probing fermionic superfluidity.
- Phonon mode damping measurements offer quantitative insights into superfluid properties.
- Predicted kinks in damping rate can reveal detailed fermion quasiparticle dispersion relation information.
