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Related Concept Videos

Forced Oscillations01:06

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent ratchets in driven Bose-Einstein condensates.

C E Creffield1, F Sols

  • 1Departamento de Física de Materiales, Universidad Complutense de Madrid, E-28040, Madrid, Spain.

Physical Review Letters
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Researchers induced a directed current in a Bose-Einstein condensate using periodic driving. Breaking spatial and time symmetries with weak driving, or just spatial symmetry with strong driving, creates a coherent quantum ratchet.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Bose-Einstein condensates (BECs) are quantum states of matter.
  • Controlling BECs with external potentials is key to understanding quantum dynamics.

Purpose of the Study:

  • Investigate the response of BECs to periodic driving potentials.
  • Explore the induction of directed currents and quantum ratchet effects.

Main Methods:

  • Applying unbiased periodic driving potentials to BECs.
  • Controlling spatial and temporal symmetries of the driving force.

Main Results:

  • Directed current induced by breaking space and time symmetries in weak driving.
  • Chaotic behavior and effective irreversibility in strong driving.
  • Spatial asymmetry alone sufficient for ratchet effect in strong driving, even without interactions.

Conclusions:

  • Demonstrated coherent quantum ratchet formation in BECs.
  • Symmetry breaking is crucial for directed current generation.
  • Strong driving leads to robust ratchet effects due to effective irreversibility.