Abstract
We report a new method for the production of Bose-Einstein condensates of
\$^133\$Cs and demonstrate the formation of a quantum degenerate mixture of
\$^87\$Rb and \$^133\$Cs. The approach exploits efficient sympathetic cooling
of \$^133\$Cs via \$^87\$Rb in a magnetic quadrupole trap prior to further
evaporative cooling in a levitated optical trap. Sacrificing all the \$^87\$Rb
during the cooling, we create single species \$^133\$Cs condensates of up to
\$6\times10^4\$ atoms. Tailoring the evaporation to retain some \$^87\$Rb, we
simultaneously create condensates of \$^87\$Rb and \$^133\$Cs in the same
trapping potential, each containing up to \$2\times10^4\$ atoms. We observe a
striking phase separation of the two species revealing the mixture to be
immiscible due to strong repulsive interspecies interactions.
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