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Phys Rev Lett. 2009 Jul 17;103(3):033004. Epub 2009 Jul 17.

Universal four-Boson states in ultracold molecular gases: resonant effects in dimer-dimer collisions.

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Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309-0440, USA.


We study the manifestations of universal four-body physics in ultracold dimer-dimer collisions. We show that resonant features associated with three-body Efimov physics and dimer-dimer scattering lengths are universally related. The emergence of universal four-boson states allows for the tunability of the dimer-dimer interaction, thus enabling the future study of ultracold molecular gases with both attractive and repulsive interactions. Moreover, our study of the interconversion between dimers and Efimov trimers shows that B2+B2-->B3+B rearrangement reactions can provide an efficient trimer formation mechanism. Our analysis of the temperature dependence of this reaction provides an interpretation of the available experimental data and sheds light on the possible experimental realization of rearrangement processes in ultracold gases.

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