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Related Experiment Videos

Weak dynamical localization in periodically kicked cold atomic gases.

C Tian1, A Kamenev, A Larkin

  • 1Department of Physics, University of Minnesota, Minneapolis, MN 55455, USA.

Physical Review Letters
|September 28, 2004
PubMed
Summary
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Quantum kicked rotor experiments show dynamical localization. Researchers found this quantum effect is delayed by four Ehrenfest times, offering new experimental predictions.

Area of Science:

  • Quantum chaos
  • Atomic physics
  • Quantum dynamics

Background:

  • Quantum kicked rotor systems experimentally realized with cold atomic gases and optical waves.
  • These systems exhibit dynamical localization in momentum space as predicted by theory.

Purpose of the Study:

  • Investigate the weak-localization regime of the quantum kicked rotor.
  • Analyze the role of the Ehrenfest time scale in the onset of dynamical localization.

Main Methods:

  • Focus on the Ehrenfest time scale, which characterizes the spread of a minimal wave packet.
  • Theoretical analysis of quantum dynamics in the weak-localization regime.

Main Results:

  • Dynamical localization onset is significantly delayed by approximately four Ehrenfest times.

Related Experiment Videos

  • Quantitative predictions for the delayed localization are provided.

    • Conclusions:

    • The Ehrenfest time scale plays a crucial role in delaying dynamical localization in quantum kicked rotor systems.
    • The findings offer testable predictions for ongoing and future cold atom experiments.