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Updated: Aug 7, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Dynamical vanishing of the order parameter in a fermionic condensate
Emil A Yuzbashyan1, Maxim Dzero
1Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
We analyzed ultracold atomic fermion condensates after changing pairing strength. The system reaches a steady state where the superfluid order parameter can vanish, exhibiting both normal and superfluid properties.
Area of Science:
- Atomic physics
- Condensed matter physics
- Quantum mechanics
Background:
- Ultracold atomic fermions form condensates with superfluid properties.
- Changes in pairing strength can significantly alter condensate dynamics.
- Understanding non-equilibrium steady states is crucial in quantum systems.
Purpose of the Study:
- To investigate the dynamics of ultracold atomic fermion condensates after an abrupt change in pairing strength.
- To determine the non-stationary steady state properties of such systems.
- To analyze the behavior of the superfluid order parameter and related quantities.
Main Methods:
- Analysis of condensate dynamics.
- Exact determination of the non-stationary steady state.
- Calculation of superfluid order parameter, condensate fraction, and superfluid density.
Main Results:
- The system evolves to a non-stationary steady state at long times.
- The superfluid order parameter approaches a constant value.
- Below a critical pairing strength, the order parameter vanishes, while superfluid density remains non-zero.
Conclusions:
- The steady state can exhibit a coexistence of normal and superfluid characteristics.
- The condensate fraction and energy gap vanish when pairing strength is reduced below a critical value.
- Superfluid density can persist even when the condensate fraction is zero.
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