| Production of dual species Bose–Einstein condensates of ~(39)K and ~(87)Rb |
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| 作者单位： | 1.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 030006, China;2.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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| 基金项目： | Project supported by the National Key R&D Program of China (Grants Nos. 2016YFA0301602 and 2018YFA0307601), the National Natural Science Foundation of China (Grant Nos. 11974224, 11704234, 11804203, 12034011, 12022406, 12004229, and 92065108), the Fund for Shanxi "1331 Project" Key Subjects Construction, and the Program of Youth Sanjin Scholar. |
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| 摘 要： | 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 is 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 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= 20.05 a_0.
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| 收稿时间： | 2021-01-30 |
Production of dual species Bose-Einstein condensates of 39K and 87Rb |
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| Institution: | 1.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-electronics, Shanxi University, Taiyuan 030006, China;2.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China |
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| Abstract: | We report the production of 39K and 87Rb Bose-Einstein condensates (BECs) in the lowest hyperfine states|F=1,mF=1 angle 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 aKRb=34a0 (a0 is the Bohr radius) and the intraspecies scattering length aK=20.05a0. |
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| Keywords: | atom cooling methods ultracold collisions ultracold gases hyperfine interactions |
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