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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Colliding Bose-Einstein condensates to observe Efimov physics.

Yujun Wang1, J P D'Incao, H-C Nägerl

  • 1Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.

Physical Review Letters
|April 7, 2010
PubMed
Summary

We found that log-periodic Efimov physics features appear at higher collision energies in three-body scattering. This phenomenon, observable through atom loss in Bose-Einstein condensate collisions, links to Efimov states.

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Mechanics
  • Few-Body Physics

Background:

  • Efimov physics describes universal three-body phenomena in quantum mechanics.
  • These effects are typically studied near the threshold energy regime.
  • Observing Efimov physics at non-zero energies is experimentally challenging.

Purpose of the Study:

  • To explore the manifestation of Efimov physics beyond the threshold energy regime.
  • To propose a method for measuring Efimov physics using atom loss in Bose-Einstein condensate collisions.
  • To establish a connection between scattering observables and Efimov states at non-zero collision energies.

Main Methods:

  • Analyzing the collision energy dependence of three-body scattering observables.
  • Simulating atom loss in collisions of Bose-Einstein condensates.
  • Investigating log-periodic features in scattering observables.

Main Results:

  • Log-periodic Efimov features were observed to extend to non-zero collision energies.
  • These features arise from the interference of two distinct pathways.
  • A direct correlation was found between scattering length oscillations and Efimov states.

Conclusions:

  • Efimov physics can be observed and measured at non-zero collision energies.
  • Atom loss in Bose-Einstein condensate collisions provides a viable experimental probe.
  • The study establishes a robust link between observable scattering phenomena and fundamental Efimov states.