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p-Wave Feshbach molecules.

J P Gaebler1, J T Stewart, J L Bohn

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

Physical Review Letters
|August 7, 2007
PubMed
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We created and detected potassium-40 molecules using p-wave Feshbach resonance. Binding energy scales linearly with magnetic fields, and molecule lifetimes were measured for different angular momentum states.

Area of Science:

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

Background:

  • Feshbach resonances are crucial for controlling ultracold atomic and molecular interactions.
  • P-wave interactions are less explored than s-wave interactions in ultracold systems.
  • Understanding molecular properties near resonance is key to quantum simulation and information processing.

Purpose of the Study:

  • To produce and detect ultracold molecules via p-wave Feshbach resonance in 40K.
  • To measure the binding energy and lifetime of these p-wave molecules.
  • To investigate the magnetic field dependence of molecular properties and the role of tunneling in quasibound states.

Main Methods:

  • Utilizing a p-wave Feshbach resonance in ultracold 40K atom collisions.

Related Experiment Videos

  • Precisely controlling magnetic fields to tune interactions near the resonance.
  • Measuring molecular binding energies through their dependence on magnetic field.
  • Determining molecular lifetimes using time-of-flight detection.

    • Main Results:

    • Successful production and detection of molecules formed via p-wave Feshbach resonance.
    • Observed approximately linear scaling of binding energy with magnetic field near resonance.
    • Measured lifetimes of bound p-wave molecules: 1.0±0.1 ms (ml=±1) and 2.3±0.2 ms (ml=0).
    • Detected quasibound molecules above resonance, with lifetimes governed by centrifugal barrier tunneling.

    Conclusions:

    • P-wave Feshbach resonance provides a viable pathway for creating ultracold molecules.
    • The magnetic field dependence of binding energy and measured lifetimes offer insights into molecular structure and interactions.
    • The study of quasibound molecules highlights the importance of tunneling dynamics in ultracold chemistry.