We report the production of ³⁹K and ⁸⁷Rb 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 ³⁹K/⁸⁷Rb to overcome the light-assisted losses of ³⁹K atoms. Gray molasses cooling on the D1 line of the ³⁹K is used to effectively increase the phase density, which improves the loading efficiency of ³⁹K into the quadrupole magnetic trap. Simultaneously, the normal molasses is employed for ⁸⁷Rb. After the microwave evaporation cooling on ⁸⁷Rb 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 ³⁹K and ⁸⁷Rb are obtained by further evaporative cooling in an 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 = 20.05a ₀.

我们报告了在最低超精细状态下产生³⁹ K 和⁸⁷ Rb 玻色-爱因斯坦凝聚 (BEC) | F = 1, m _F = 1 > 同时。^我们在39 K/ ⁸⁷ Rb的明/暗磁光阱 (MOT) 中收集原子，以克服³⁹ K 原子的光辅助损失。^在39 K的D1线上采用灰糖浆冷却，有效提高了相密度，提高了³⁹ K进入四极磁阱的加载效率。同时，普通糖蜜用于⁸⁷ Rb。⁸⁷上微波蒸发冷却后Rb 在光塞磁阱中，原子混合物被转移到交叉光偶极子阱中，在此研究两种物质在不同超精细状态组合中的碰撞特性。³⁹ K 和⁸⁷ Rb双物种 BEC是通过在 372.6 G 磁场的光学偶极阱中进一步蒸发冷却获得的，背景排斥性种间散射长度a _KRb = 34 a ₀（a ₀是玻尔半径）和种内散射长度a _K = 20.05 a ₀。