Simple model of a Feshbach resonance in the strong-coupling regime

T. Wasak, M. Krych, Z. Idziaszek, M. Trippenbach, Y. Avishai, Y. B. Band

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


We use the dressed potentials obtained in the adiabatic representation of two coupled channels to calculate s-wave Feshbach resonances in a three-dimensional spherically symmetric potential with an open channel interacting with a closed channel. Analytic expressions for the s-wave scattering length a and number of resonances are obtained for a piecewise constant model with a piecewise constant interaction of the open and closed channels near the origin. We show analytically and numerically that, for strong enough coupling strength, Feshbach resonances can exist even when the closed channel does not have a bound state.

Original languageEnglish
Article number052719
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
StatePublished - 21 Nov 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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