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Stable 85Rb bose-einstein condensates with widely tunable interactions

Cornish1, Claussen, Roberts

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

Physical Review Letters
|September 6, 2000
PubMed
Summary
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Researchers achieved Bose-Einstein condensation in rubidium-85 atoms. Using Feshbach resonance, they tuned interactions, observing condensate collapse and high-energy atom emission.

Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Condensed matter physics

Background:

  • Bose-Einstein condensation (BEC) is a quantum state of matter formed by cooling atoms to near absolute zero.
  • Controlling interatomic interactions is crucial for studying BEC properties and applications.
  • Magnetic-field-induced Feshbach resonances offer a powerful tool for manipulating atomic interactions.

Purpose of the Study:

  • To achieve Bose-Einstein condensation in a magnetically trapped sample of rubidium-85 atoms.
  • To investigate the effects of tunable interatomic interactions on condensate properties.
  • To explore the transition from repulsive to attractive interactions and its consequences.

Main Methods:

  • Magnetic trapping of 85Rb atoms.

Related Experiment Videos

  • Utilizing a magnetic-field-induced Feshbach resonance to control the scattering length.
  • Tuning the condensate self-interaction energy across a wide range, from repulsive to attractive.

    • Main Results:

    • Successful achievement of long-lived Bose-Einstein condensates with up to 10^4 atoms.
    • Demonstrated magnetic tuning of condensate self-interaction energy from repulsive to attractive regimes.
    • Observed condensate collapse and subsequent emission of high-energy atoms upon switching to attractive interactions.

    Conclusions:

    • The study demonstrates a versatile method for controlling interactions in ultracold atomic gases.
    • This system provides new avenues for exploring fundamental physics of Bose-Einstein condensates.
    • The observed collapse and atom emission offer insights into strongly interacting quantum systems.