Orateur
Dmitri Fedorov
(Aarhus University)
Description
Feshbach resonances are an experimental tool to effectively tune the inter-atomic interaction -- in particular, the scattering length -- in trapped cold gases. When the scattering length becomes large and negative, the condensed bose-gas collapses.
Theoretically condensates are often described using the Gross-Pitaevskii model with a variable-strength zero-range interaction which mimics phenomenologically the effects of Feshbach resonances.
We use here a Gross-Pitaevskii model with a two-channel zero-range potential which not only naturally describes the Feshbach resonance but also includes finite-range effects. We show that this model is able to naturally describe the collapse of the condensate, and we also compare the two-channel results with the ordinary single-channel Gross-Pitaevskii model.
Author
Dmitri Fedorov
(Aarhus University)
Co-auteur
Aksel Jensen
(Aarhus University)
