Josephson frequency of resonantly-coupled atomic and molecular condensates

Details Josephson frequency of resonantly-coupled atomic and molecular condensates Josephson frequency of resonantly-coupled atomic and molecular condensates

2003-03-12

arxiv.org/abs/cond-mat/0303230v1

Physics

Condensed Matter

Submitted to the New. J. Phys. Focus Issue on Quantum Gases

Scientific paper

10.1088/1367-2630/5/1/369

Motivated by recent experiments [Claussen N R et al. 2003 Preprint cond-mat/0302195] we investigate the magnetic-field dependence of the Josephson frequency of coherent atom-molecule oscillations near a Feshbach resonance. Far off resonance this frequency is determined by two-body physics. However, the Josephson frequency is relatively large and a description purely in terms of scattering lengths turns out to be inadequate. In particular, we have to include the effective range parameter of the interatomic interaction in our calculations. Close to resonance, the frequency deviates from the two-body results due to various many-body shifts. Considering also the many-body effects, we find perfect agreement with the experimental results over the entire range of magnetic field.

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