Production of dual species Bose-Einstein condensates of 39K and 87Rb

doi:10.1088/1674-1056/abee6d

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 63401-063401.doi: 10.1088/1674-1056/abee6d

Production of dual species Bose-Einstein condensates of ³⁹K and ⁸⁷Rb

Cheng-Dong Mi(米成栋)^1,2, Khan Sadiq Nawaz^1,2, Peng-Jun Wang(王鹏军)^1,2,†, Liang-Chao Chen(陈良超)^1,2, Zeng-Ming Meng(孟增明)^1,2, Lianghui Huang(黄良辉)^1,2, and Jing Zhang(张靖)^1,2,‡

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

收稿日期:2021-01-30 修回日期:2021-03-11 接受日期:2021-03-15 出版日期:2021-05-18 发布日期:2021-05-20
通讯作者: Peng-Jun Wang, Jing Zhang E-mail:pengjun_wang@sxu.edu.cn;jzhang74@sxu.edu.cn,jzhang74@yahoo.com
基金资助:
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.

Production of dual species Bose-Einstein condensates of ³⁹K and ⁸⁷Rb

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

Received:2021-01-30 Revised:2021-03-11 Accepted:2021-03-15 Online:2021-05-18 Published:2021-05-20
Contact: Peng-Jun Wang, Jing Zhang E-mail:pengjun_wang@sxu.edu.cn;jzhang74@sxu.edu.cn,jzhang74@yahoo.com
Supported by:
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.

摘要/Abstract

摘要： We report the production of ³⁹K and ⁸⁷Rb Bose-Einstein condensates (BECs) in the lowest hyperfine states|F=1,m_F=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 a_KRb=34a₀ (a₀ is the Bohr radius) and the intraspecies scattering length a_K=20.05a₀.

关键词: atom cooling methods, ultracold collisions, ultracold gases, hyperfine interactions

Abstract: We report the production of ³⁹K and ⁸⁷Rb Bose-Einstein condensates (BECs) in the lowest hyperfine states|F=1,m_F=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 a_KRb=34a₀ (a₀ is the Bohr radius) and the intraspecies scattering length a_K=20.05a₀.

Key words: atom cooling methods, ultracold collisions, ultracold gases, hyperfine interactions

中图分类号: (Atom cooling methods)

37.10.De

34.50.Cx (Elastic; ultracold collisions) 32.80.Wr (Other multiphoton processes) 67.85.-d (Ultracold gases, trapped gases)

Cheng-Dong Mi(米成栋), Khan Sadiq Nawaz, Peng-Jun Wang(王鹏军), Liang-Chao Chen(陈良超), Zeng-Ming Meng(孟增明), Lianghui Huang(黄良辉), and Jing Zhang(张靖). Production of dual species Bose-Einstein condensates of ³⁹K and ⁸⁷Rb[J]. 中国物理B, 2021, 30(6): 63401-063401.

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Production of dual species Bose-Einstein condensates of ³⁹K and ⁸⁷Rb

Production of dual species Bose-Einstein condensates of ³⁹K and ⁸⁷Rb

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