Optimal preparation of Bose and Fermi atomic gas mixtures of ^(87)Rb and ^(40)K in a crossed optical dipole trap  

作　　者：丁培波 单标 赵宇航 杨雅婧 陈良超 孟增明 王鹏军 黄良辉 Peibo Ding;Biao Shan;Yuhang Zhao;Yajing Yang;Liangchao Chen;Zengming Meng;Pengjun Wang;Lianghui Huang(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;Hefei National Laboratory,Hefei 230000,China)

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-electronics,Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China [2]Hefei National Laboratory,Hefei 230000,China

出　　处：《Chinese Physics B》2024年第6期356-361,共6页中国物理B（英文版）

基　　金：supported by the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302003);the National Natural Science Foundation of China (Grant Nos. 12034011, U23A6004, 12374245,12322409, 92065108, 11974224, and 12022406);the National Key Research and Development Program of China (Grant Nos. 2022YFA1404101 and 2021YFA1401700);the Fund for Shanxi 1331 Project Key Subjects Construction。

摘　　要：We report on the optimal production of the Bose and Fermi mixtures with ^(87) Rb and ^(40)K in a crossed optical dipole trap(ODT).We measure the atomic number and lifetime of the mixtures in combination of the spin state |F=9/2,m_(F)=9/2> of^(40)K and |1,1>of ^(87) Rb in the ODT,which is larger and longer compared with the combination of the spin state |9/2,9/2> of^(40)K and 12,2) of ^(87)Rb in the ODT.We observe the atomic numbers of ^(87)Rb and ^(40)K shown in each stage of the sympathetic cooling process while gradually reducing the depth of the optical trap.By optimizing the relative loading time of atomic mixtures in the MOT,we obtain the large atomic number of ^(40)K(~6 ×10^(6)) or the mixtures of atoms with an equal number(~1.6 × 10^(6)) at the end of evaporative cooling in the ODT.We experimentally investigate the evaporative cooling in an enlarged volume of the ODT via adding a third laser beam to the crossed ODT and found that more atoms(8 × 10^(6)) and higher degeneracy(T/T_(F)=0.25) of Fermi gases are obtained.The ultracold atomic gas mixtures pave the way to explore phenomena such as few-body collisions and the Bose-Fermi Hubbard model,as well as for creating ground-state molecules of ^(87)Rb^(40)K.

关 键 词：optical dipole trap Bose and Fermi gas mixtures atomic lifetime 

分 类 号：O469[理学—凝聚态物理]