Multichannel effects in the Efimov regime from broad to narrow Feshbach resonances

T. Secker, D.J.M. Ahmed-Braun, P.M.A. Mestrom, S.J.J.M.F. Kokkelmans

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We study Efimov physics of three identical bosons with pairwise multichannel interactions for Feshbach resonances of adjustable width in magnetic field. We find that the two-body multichannel realization of the interaction can affect the universal Efimov spectrum, especially for resonances of intermediate width. We analyze two scenarios that are equivalent on the two-body level but differ in their realization in three-body multichannel spin space. The deviations in the Efimov spectra of these scenarios are caused by trimer states in the closed interaction channels whose binding energy and coupling strength to the Efimov states depend on the spin realization. However, in the narrow resonance limit the Efimov spectrum is set by the resonance width parameter r∗ only and does not depend on the realization in spin space. We find this limit to be even independent of the interaction potential considered. In the broad resonance limit all excited Efimov trimer energies approach the ones from the corresponding single-channel system for the scenarios investigated.

Originele taal-2Engels
Aantal pagina's18
TijdschriftPhysical Review A
Nummer van het tijdschrift5
StatusGepubliceerd - mei 2021

Bibliografische nota

Funding Information:
We thank J. Li, V. Colussi, G. Groeneveld, and S. Musolino for discussions. This research is financially supported by the Netherlands Organisation for Scientific Research (NWO) under Grant No. 680-47-623.

Publisher Copyright:
© 2021 American Physical Society.

Copyright 2021 Elsevier B.V., All rights reserved.


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