Dual-Species Bose-Einstein Condensate of ${}^{87}$Rb and ${}^{133}$Cs

Abstract

We report the formation of a dual-species Bose-Einstein condensate of ${}^{87}$Rb and ${}^{133}$Cs in the same trapping potential. Our method exploits the efficient sympathetic cooling of ${}^{133}$Cs via elastic collisions with ${}^{87}$Rb, initially in a magnetic quadrupole trap and subsequently in a levitated optical trap. The two condensates each contain up to $2\times 10^4$ atoms and exhibit a striking phase separation, revealing the mixture to be immiscible due to strong repulsive interspecies interactions. Sacrificing all the ${}^{87}$Rb during the cooling, we create single species ${}^{133}$Cs condensates of up to $6\times 10^4$ atoms.

4 pages and 4 figures

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