中国物理B ›› 2011, Vol. 20 ›› Issue (1): 16701-016701.doi: 10.1088/1674-1056/20/1/016701

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Experimental investigation of evaporative cooling mixture of bosonic 87Rb and fermionic 40K atoms with microwave and radio frequency radiation

王鹏军, 熊德智, 付正坤, 张靖   

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2010-06-21 修回日期:2010-07-10 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the National Science Foundation for Distinguished Young Scholars of China (Grant No. 10725416), the National Basic Research Program of China (Grant No. 2006CB921101 and 2011CB921601), the National Science Foundation NSFC Project for Excellent Research Team, China (Grant No. 60821004).

Experimental investigation of evaporative cooling mixture of bosonic 87Rb and fermionic 40K atoms with microwave and radio frequency radiation

Wang Peng-Jun(王鹏军),Xiong De-Zhi(熊德智), Fu Zheng-Kun(付正坤),and Zhang Jing(张靖)†   

  1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China
  • Received:2010-06-21 Revised:2010-07-10 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the National Science Foundation for Distinguished Young Scholars of China (Grant No. 10725416), the National Basic Research Program of China (Grant No. 2006CB921101 and 2011CB921601), the National Science Foundation NSFC Project for Excellent Research Team, China (Grant No. 60821004).

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摘要： We investigate sympathetic cooling fermions 40K by evaporatively cooling bosonic 87Rb atoms in a magnetic trap with microwave and radio frequency induced evaporations in detail. The mixture of bosonic and fermionic atoms is prepared in their polarized spin states |F=9/2, mF=9/2> for 40K and |F=2, mF=2> for 87Rb, which is trapped in Quadrupole--Ioffe--Configuration trap. Comparing microwave with radio frequency evaporatively cooling bosonic 87Rb atoms with sympathetically cooling Fermi gas 40K, we find that the presence of rubidium atoms in the |2,1> Zeeman states, which are generated in the evaporative process, gives rise to a significant loss of 40K due to inelastic collisions. Thus, the rubidium atoms populated in the |2, 1> Zeeman states should be removed in order to effectively perform sympathetically cooling 40K with the evaporatively cooled 87Rb atoms.

关键词: microwave and radio frequency induced evaporation, sympathetically cooling, inelastic collisions

Abstract: We investigate sympathetic cooling fermions 40K by evaporatively cooling bosonic 87Rb atoms in a magnetic trap with microwave and radio frequency induced evaporations in detail. The mixture of bosonic and fermionic atoms is prepared in their polarized spin states |F=9/2, mF=9/2$\rangle$ for 40K and |F=2, mF=2$\rangle$ for 87Rb, which is trapped in Quadrupole–Ioffe–Configuration trap. Comparing microwave with radio frequency evaporatively cooling bosonic 87Rb atoms with sympathetically cooling Fermi gas 40K, we find that the presence of rubidium atoms in the |2,1$\rangle$ Zeeman states, which are generated in the evaporative process, gives rise to a significant loss of 40K due to inelastic collisions. Thus, the rubidium atoms populated in the |2, 1$\rangle$ Zeeman states should be removed in order to effectively perform sympathetically cooling 40K with the evaporatively cooled 87Rb atoms.

Key words: microwave and radio frequency induced evaporation, sympathetically cooling, inelastic collisions

中图分类号:  (Mixtures of Bose and Fermi gases)

  • 67.85.Pq
37.10.De (Atom cooling methods) 64.70.fm (Thermodynamics studies of evaporation and condensation) 32.10.Fn (Fine and hyperfine structure)