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Universal Efimov physics in ultracold gases

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  • UserServaas Kokkelmans (Eindhoven)
  • ClockTuesday 02 March 2010, 15:30-16:30
  • HousePhysics East 217.

If you have a question about this talk, please contact Vincent Boyer.

We report on experimental and theoretical evidence of universality in ultracold Li-7 atoms three-body recombination loss in the vicinity of a Feshbach resonance [1]. We observe a recombination minimum and an Efimov resonance in regions of positive and negative scattering lengths. Both observed features lie deeply within the range of validity of the universal theory and we find that the relations between their widths and locations, are in an excellent agreement with the theoretical predictions.

We also investigate the possibility to stabilize Efimov trimers in optical lattices. We present universal solutions of three bosons in a harmonic potential, for all ranges of the scattering length and harmonic oscillator length. We compare our results to the limiting cases, such as that of a vanishing trapping potential. The combination of being able to tune both length parameters gives rise to quite distinct solutions of these trimers, and allows for minimizing the inelastic losses.

[1] Noam Gross, Zav Shotan, Servaas Kokkelmans, and Lev Khaykovich, Phys. Rev. Lett. 103, 163202 (2009).

This talk is part of the Cold Atoms series.

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