The heteronuclear Eﬁmov effect
Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and
Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn,
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Ultracold quantum gases with large scattering length show resonant enhancement of three-body loss rates when an Eﬁmov trimer is at the scattering threshold. We calculate the three-body loss rates in heteronuclear mixtures of atoms for the case of large scattering length between the unlike atoms. Using zero-range interactions, we present results from the numerical solution of the integral equations for the recombination amplitude in momentum space and extract expressions for the recombination rate constants. Moreover, we calculate the relative positions of loss features for diﬀerent sign of the scattering length and a ﬁrst comparison with available experimental data is shown.
© Owned by the authors, published by EDP Sciences, 2010