中国物理B ›› 2011, Vol. 20 ›› Issue (1): 16701-016701.doi: 10.1088/1674-1056/20/1/016701
王鹏军, 熊德智, 付正坤, 张靖
Wang Peng-Jun(王鹏军),Xiong De-Zhi(熊德智), Fu Zheng-Kun(付正坤),and Zhang Jing(张靖)†
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.
中图分类号: (Mixtures of Bose and Fermi gases)