Double resonances in Borromean heteronuclear triatomic systems

Details Double resonances in Borromean heteronuclear triatomic systems Double resonances in Borromean heteronuclear triatomic systems

2010-05-14

arxiv.org/abs/1005.2576v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We investigate the occurrence of Borromean three-body continuum s-wave resonances, in an $\alpha\alpha\beta$ system for large negative two-body scattering lengths. The energy and width are determined by a scaling function with arguments given by energy ratios of the two-body virtual state subsystem energies with the shallowest three-body bound state. The Borromean continuum resonances emerging from Efimov states present a peculiar behavior for trapped ultracold atoms near a Feshbach resonance: two resonances with equal energies at different values of the scattering length. The corresponding three-body recombination peaks should merge as the temperature is raised, with one moving towards lower values of the scattering length as the other moves to larger values.

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