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Updated: Dec 27, 2025

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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Parametric heating in a 2D periodically-driven bosonic system: Beyond the weakly-interacting regime.
Summary
Parametric instabilities drive rapid heating in ultracold bosons within 2D optical lattices. Unstable Bogoliubov modes, not higher Floquet bands, dominate Bose-Einstein condensate decay, especially with multi-directional drives.
Area of Science:
- Quantum physics
- Ultracold atoms
- Optical lattices
Background:
- Periodically-driven quantum systems exhibit unique phenomena.
- Parametric instabilities can lead to rapid energy absorption.
- Bose-Einstein condensates (BECs) in optical lattices are sensitive probes of quantum dynamics.
Purpose of the Study:
- Investigate parametric instabilities' effect on ultracold boson heating.
- Analyze heating dynamics under different periodic drive types.
- Compare BEC decay mechanisms with theoretical predictions.
Main Methods:
- Experimental study of bosons in 2D optical lattices.
- Application of three distinct periodic drive protocols (linear x, diagonal, circular).
- Analysis of Bose-Einstein condensate (BEC) decay rates and mode stability.
Main Results:
- BEC decay is primarily driven by unstable Bogoliubov modes.
- Heating rates significantly increase with multi-directional lattice shaking (x and y).
- Observed rapid decay rate increase at large drive amplitudes, suggesting a strongly-coupled regime.
Conclusions:
- Parametric instabilities, via Bogoliubov modes, are key to short-time heating in driven 2D optical lattices.
- Heating efficiency depends non-trivially on drive geometry and amplitude.
- Findings align with and extend theoretical predictions for driven quantum systems.
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