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Related Experiment Videos

Bose-Einstein condensation of molecules.

S Jochim1, M Bartenstein, A Altmeyer

  • 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria.

Science (New York, N.Y.)
|November 15, 2003
PubMed
Summary

We achieved Bose-Einstein condensation of over 100,000 lithium-6 molecules in an optical trap. This quantum state was reached using fermionic lithium atoms and evaporative cooling near a Feshbach resonance.

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Area of Science:

  • Quantum physics
  • Ultracold atomic gases
  • Molecular Bose-Einstein condensation

Background:

  • Bose-Einstein condensation (BEC) is a state of matter formed by bosons cooled to near absolute zero.
  • Creating molecular BECs is challenging due to the complexity of molecule formation and cooling.

Purpose of the Study:

  • To achieve Bose-Einstein condensation of lithium-6 (Li2) molecules.
  • To investigate the properties of molecular BECs formed from fermionic atoms.

Main Methods:

  • Utilizing a spin mixture of fermionic lithium atoms.
  • Employing forced evaporative cooling near a Feshbach resonance to form molecules via three-body recombination.
  • Confining the molecules in an optical trap.

Main Results:

Related Experiment Videos

  • Successfully condensed over 10^5 Li2 molecules into a long-lived thermal equilibrium state.
  • Measured the characteristic frequency of a collective excitation mode.
  • Demonstrated magnetic field-dependent mean-field behavior through controlled condensate spilling.

Conclusions:

  • This work demonstrates a viable pathway to creating ultracold molecular Bose-Einstein condensates.
  • The observed phenomena provide insights into the quantum behavior of strongly interacting molecular gases.