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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Nonlinear resonances in delta-kicked Bose-Einstein condensates.

T S Monteiro¹, A Rançon, J Ruostekoski

¹Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom. t.monteiro@ucl.ac.uk

Physical Review Letters

|March 5, 2009

Summary

Atomic interactions in delta-kicked cold atoms create nonlinear dynamics. A key signature is an abrupt cutoff on leading resonances due to combined excitation processes.

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Area of Science:

Atomic physics
Quantum dynamics
Nonlinear systems

Background:

Cold atoms are essential for studying quantum phenomena.
Delta-kicked models provide insights into quantum chaos and dynamics.
Atomic interactions can significantly alter the behavior of quantum systems.

Purpose of the Study:

To investigate the influence of atomic interactions on the dynamics of delta-kicked cold atoms.
To identify and characterize the signatures of nonlinear dynamics in this system.

Main Methods:

Theoretical analysis of atomic interactions in a delta-kicked system.
Investigation of excitation paths involving Beliaev and Landau processes.
Study of dynamical instability and its associated phenomena.

Main Results:

A distinct and abrupt cutoff on leading resonances was observed as a signature of nonlinear dynamics.
This cutoff is attributed to a combination of Beliaev and Landau excitation processes.
Dynamical instability was found to manifest as a regime of exponential oscillations.

Conclusions:

Atomic interactions introduce significant nonlinear effects in delta-kicked cold atoms.
The observed cutoff and exponential oscillations provide clear evidence of these nonlinearities.
The findings offer analogies to nonlinear self-trapping phenomena.