Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.8: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Analytic study of the expansion dynamics of multi-species Bose-Einstein condensates — •Matthias Meister, Albert Roura, Wolfgang P. Schleich, and the QUANTUS Team — Institut für Quantenphysik, Universität Ulm

Quantum tests of the weak equivalence principle can be performed by comparing the free fall of different species of ultra-cold quantum gases via differential interferometry measurements. Hence, it is essential to have a theoretical model for such mixtures.

Starting from the ground-state solution in the Thomas-Fermi approximation, we provide an efficient analytical description of the expansion dynamics of a multi-species mixture of Bose-Einstein condensates (BECs). For this purpose we generalize the scaling approach developed for a single-species BEC [1] to the case of multiple species. We show that this technique is possible as long as the trapping frequencies are identical for all species. Thus, this formulation constitutes a good approximation for mixtures of different isotopes of a heavy element (e. g. ⁸⁵Rb and ⁸⁷Rb) confined by the same trapping potential.

The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number 50WM1136.

[1] Y. Castin and R. Dum, Phys. Rev. Lett. 77, 5315 (1996).