We report on the production of a $^{41}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ dual-species Bose-Einstein condensate in a hybrid trap, consisting of a magnetic quadrupole and an optical dipole potential. After loading both atomic species in the trap, we cool down $^{87}\mathrm{Rb}$ first by magnetic and then by optical evaporation, while $^{41}\mathrm{K}$ is sympathetically cooled by elastic collisions with $^{87}\mathrm{Rb}$ . We eventually produce two-component condensates with more than ${10}^{5}$ atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.We report on the production of a $^{41}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ dual-species Bose-Einstein condensate in a hybrid trap, consisting of a magnetic quadrupole and an optical dipole potential. After loading both atomic species in the trap, we cool down $^{87}\mathrm{Rb}$ first by magnetic and then by optical evaporation, while $^{41}\mathrm{K}$ is sympathetically cooled by elastic collisions with $^{87}\mathrm{Rb}$. We eventually produce two-component condensates with more than ${10}^{5}$ atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.

arXiv:1810.08394Physical Review ADec 12, 201838 citations

Towards A Two-Species Bose-Einstein Condensate

E. Arimondo

Kluwer Academic Publishers eBooksDec 11, 20050 citations

Understanding the production of dual Bose-Einstein condensation with sympathetic cooling

Guillaume Delannoy, S. G. Murdoch, Vincent Boyer +3 more

We show, both experimentally and theoretically, that sympathetic cooling of ${}^{87}\mathrm{Rb}$ atoms in the $|{F=2,m}_{F}=2〉$ state by evaporatively cooled atoms in the $|{F=1,m}_{F}=\ensuremath{-}1〉$ state can be precisely controlled so as to produce a condensate in either or both states. We also study the thermalization rate between two species. Our model renders a quantitative account of the observed role of the overlap between the two clouds and verifies that sympathetic cooling becomes inefficient when the masses are very different. Our calculation also yields an analytical expression of the thermalization rate for a single species.We show, both experimentally and theoretically, that sympathetic cooling of ${}^{87}\mathrm{Rb}$ atoms in the $|{F=2,m}_{F}=2〉$ state by evaporatively cooled atoms in the $|{F=1,m}_{F}=\ensuremath{-}1〉$ state can be precisely controlled so as to produce a condensate in either or both states. We also study the thermalization rate between two species. Our model renders a quantitative account of the observed role of the overlap between the two clouds and verifies that sympathetic cooling becomes inefficient when the masses are very different. Our calculation also yields an analytical expression of the thermalization rate for a single species.

arXiv:quant-ph/0101130Physical Review AApr 9, 200166 citations

^{87}\mathrm{Rb}

first by magnetic and then by optical evaporation, while

^{41}\mathrm{K}

is sympathetically cooled by elastic collisions with

^{87}\mathrm{Rb}

. We eventually produce two-component condensates with more than

{10}^{5}

atoms and tunable species population imbalance. We observe the immiscibility of the quantum mixture by measuring the density profile of each species after releasing them from the trap.

We show, both experimentally and theoretically, that sympathetic cooling of

{}^{87}\mathrm{Rb}

atoms in the

|{F=2,m}_{F}=2〉

state by evaporatively cooled atoms in the $|{F=1,m}_{F}=\ensuremath{-}1〉$ state can be precisely controlled so as to produce a condensate in either or both states. We also study the thermalization rate between two species. Our model renders a quantitative account of the observed role of the overlap between the two clouds and verifies that sympathetic cooling becomes inefficient when the masses are very different. Our calculation also yields an analytical expression of the thermalization rate for a single species.