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Driving Bose-Einstein-condensate vorticity with a rotating normal cloud.

P C Haljan1, I Coddington, P Engels

  • 1JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.

Physical Review Letters
|December 12, 2001
PubMed
Summary
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Researchers used evaporative cooling to spin ultracold Rubidium-87 gas, observing vortex nucleation in Bose-Einstein condensates. They achieved high rotation rates, revealing a vortex nucleation threshold below theoretical predictions.

Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Gases
  • Condensed Matter Physics

Background:

  • Bose-Einstein condensates (BECs) are quantum states of matter formed at ultracold temperatures.
  • Understanding vortex nucleation in rotating BECs is crucial for quantum fluid dynamics.
  • Evaporative cooling is a standard technique for reaching quantum degeneracy.

Purpose of the Study:

  • To develop and demonstrate an evaporative cooling technique for accelerating the rotation of an ultracold gas.
  • To investigate vortex nucleation in a Bose-Einstein condensate during spin-up.
  • To measure rotation rates and compare vortex nucleation thresholds with theoretical models.

Main Methods:

  • Confining ultracold Rubidium-87 gas in a static harmonic potential.

Related Experiment Videos

  • Employing evaporative cooling to spin up and cool the gas below quantum degeneracy.
  • Measuring condensate aspect ratio and surface-wave excitations to infer rotation.
  • Observing the intrinsic nucleation of the first vortex.

    • Main Results:

    • Achieved effective rigid-body rotation of the Bose-Einstein condensate.
    • Inferred rotation rates up to 94% of the centrifugal limit.
    • Observed a distinct threshold in the normal cloud's rotation for vortex nucleation.
    • Found the nucleation threshold to be lower than predicted by surface-wave excitation models.

    Conclusions:

    • Evaporative cooling is an effective method for rotating ultracold atomic gases and inducing vorticity.
    • The observed vortex nucleation threshold provides new insights into the dynamics of quantum fluids.
    • Experimental results challenge existing theoretical predictions for vortex formation mechanisms in BECs.