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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

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Published on: March 30, 2017

Ultracold heteronuclear fermi-fermi molecules.

A-C Voigt1, M Taglieber, L Costa

  • 1Department für Physik der Ludwig-Maximilians-Universität, Schellingstrasse 4, 80799 Munich, Germany. arne.voigt@mpq.mpg.de

Physical Review Letters
|March 5, 2009
PubMed
Summary

Researchers created ultracold bosonic heteronuclear molecules from two fermionic species, lithium-6 (6Li) and potassium-40 (40K). These molecules exhibit extended lifetimes, exceeding 100 ms near resonance in a harmonic trap.

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Area of Science:

  • Quantum physics
  • Ultracold atoms and molecules
  • Quantum chemistry

Background:

  • Ultracold heteronuclear molecules are crucial for fundamental physics research and quantum technologies.
  • Creating and controlling molecules from two different fermionic species presents significant experimental challenges.

Purpose of the Study:

  • To report the first creation of ultracold bosonic heteronuclear molecules from two fermionic species (6Li and 40K).
  • To investigate the association efficiency and molecular lifetimes near an interspecies Feshbach resonance.

Main Methods:

  • Utilized a magnetic field sweep across an interspecies s-wave Feshbach resonance to associate molecules.
  • Employed direct imaging techniques to observe and measure molecular properties.
  • Stored the molecule-atom mixture in a harmonic trap.

Main Results:

  • Successfully created ultracold bosonic heteronuclear molecules of 6Li and 40K.
  • Achieved high association efficiencies of up to 50%, creating up to 4x10^4 molecules.
  • Measured increased molecular lifetimes exceeding 100 ms near the Feshbach resonance.

Conclusions:

  • Demonstrated a robust method for creating ultracold bosonic heteronuclear molecules from fermionic precursors.
  • The observed long molecular lifetimes open possibilities for advanced studies in ultracold chemistry and quantum simulation.
  • This work provides a new platform for exploring quantum phenomena with heteronuclear molecules.