Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum gases: Bosons, mixtures and spinor gases

Q 12.4: Talk

Monday, March 17, 2014, 14:45–15:00, UDL HS2002

Thermalization measurements on an ultracold mixture of metastable triplet He and Rb atoms — •Hari P. Mishra, Adonis S. Flores, Wim Vassen, and Steven Knoop — LaserLaB, VU University, Amsterdam, The Netherlands

We have experimentally studied interspecies thermalization in an ultracold mixture of metastable triplet ⁴He and ⁸⁷Rb atoms in a quadrupole magnetic trap. This extreme mass-imbalance mixture is interesting for testing the scale invariance of the spectrum of Efimov trimers. Unfortunately, information on the doublet and quartet interaction potentials is scarse and no spectroscopic data is available. Our thermalization measurements, in combination with numerical calculations of the temperature dependent cross section, provide the very first determination of the quartet scattering length. We will discuss its consequence for our cooling scheme to realize an ultracold mixture in an optical dipole trap, required to search for and utilize interspecies Feshbach resonances. Also prospects for an ultracold mixture of metastable ³He and ⁸⁷Rb are discussed.