2000 character limit reached
Dual-Species Bose-Einstein Condensate of $^{87}$Rb and $^{133}$Cs (1102.1576v4)
Published 8 Feb 2011 in physics.atom-ph
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 $2\times10{4}$ 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 $6\times10{4}$ atoms.