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Quasiperiodically driven ratchets for cold atoms.

R Gommers1, S Denisov, F Renzoni

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

Physical Review Letters
|August 16, 2006
PubMed
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We experimentally studied quasiperiodicity in driven ratchets for cold atoms. Depending on driving, this leads to transport suppression or symmetry restoration, revealing key physics of quantum systems.

Area of Science:

  • Atomic physics
  • Quantum dynamics
  • Condensed matter physics

Background:

  • Driven ratchets are crucial for understanding directed transport in quantum systems.
  • Quasiperiodicity introduces complex dynamics and potential symmetry breaking.
  • Cold atoms provide a controllable platform for investigating fundamental physics.

Purpose of the Study:

  • To experimentally explore the transition to quasiperiodicity in driven ratchets for cold atoms.
  • To analyze the interplay between symmetries and particle transport near the quasiperiodic regime.
  • To understand how different driving protocols influence quasiperiodic behavior.

Main Methods:

  • Experimental investigation using cold atom ensembles.
  • Implementation of driven ratchet systems.

Related Experiment Videos

  • Analysis of transport properties and system symmetries.

    • Main Results:

    • Quasiperiodicity can lead to complete suppression of directed transport.
    • Specific driving protocols restore symmetries typically observed in periodic systems.
    • The route to quasiperiodicity is sensitive to the driving protocol.

    Conclusions:

    • The study reveals a nuanced relationship between quasiperiodicity, symmetry, and transport in driven quantum systems.
    • Experimental results highlight the importance of driving protocol selection for controlling quantum transport.
    • Findings contribute to the fundamental understanding of non-equilibrium quantum dynamics.