Shallow Efimov tetramer as inelastic virtual state and resonant enhancement of the atom-trimer relaxation
Centro de Física Nuclear da Universidade de Lisboa - P-1649-003 Lisboa, Portugal, EU
Accepted: 28 June 2011
We use exact four-boson scattering equations in the momentum-space framework to study the universal properties of shallow Efimov tetramers and their dependence on the two-boson scattering length. We demonstrate that, in contrast to previous predictions, the shallow tetramer in a particular experimentally unexplored regime is not an unstable bound state but an inelastic virtual state. This leads to a resonant behaviour of the atom-trimer scattering length and thereby to a resonant enhancement of the trimer relaxation in ultracold atom-trimer mixtures.
PACS: 34.50.-s – Scattering of atoms and molecules / 34.50.Cx – Elastic; ultracold collisions
© EPLA, 2011