Production of dual species Bose-Einstein condensates of ${}^{39}$K and ${}^{87}$Rb

Abstract

We report the production of ${}^{39}$K and ${}^{87}$Rb Bose-Einstein condensates (BECs) in the lowest hyperfine states $|F=1,m_F=1⟩$ simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of ${}^{39}$K/${}^{87}$Rb to overcome the light-assisted losses of ${}^{39}$K atoms. Gray molasses cooling on the D1 line of the ${}^{39}$K is used to effectively increase the phase density, which improves the loading efficiency of ${}^{39}$K into the quadrupole magnetic trap. Simultaneously, the normal molasses are employed for ${}^{87}$Rb. After the microwave evaporation cooling on ${}^{87}$Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of ${}^{39}$K and ${}^{87}$Rb are obtained by further evaporative cooling in optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length $a_{KRb}$ = 34 $a_0$ ($a_0$ is the Bohr radius) and the intraspecies scattering length $a_K$ = 20.05 $a_0$.

8 pages, 7 figures, Accepted by Chinese Phys. B

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Cited by in corpus (3)

• Observation of high partial-wave Feshbach resonances in ${}^{39}$K Bose-Einstein condensates
• Stable three-dimensional solitons in spin-orbit-coupled atomic-molecular condensates
• Experimental study of matter-wave four-wave mixing in ${}^{39}$K Bose-Einstein condensates with tunable interaction