Universal dimer in a collisionally opaque medium: Experimental observables and Efimov resonances

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Abstract

A universal dimer is subject to secondary collisions with atoms when formed in a cloud of ultracold atoms via three-body recombination. We show that in a collisionally opaque medium, the value of the scattering length that results in the maximum number of secondary collisions may not correspond to the Efimov resonance at the atom-dimer threshold and thus cannot be automatically associated with it. This result explains a number of controversies in recent experimental results on universal three-body states and supports the emerging evidence for the significant finite range corrections to the first excited Efimov energy level.

Original languageEnglish
Article number130403
JournalPhysical Review Letters
Volume108
Issue number13
DOIs
StatePublished - 30 Mar 2012

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