Quantum degenerate Bose–Fermi atomic gas mixture of 23Na and 40K

作     者：李子亮 顾正宇 师振莲 王鹏军 张靖 Ziliang Li;Zhengyu Gu;Zhenlian Shi;Pengjun Wang;Jing Zhang

作者机构：State Key Laboratory of Quantum Optics and Quantum Optics DevicesInstitute of Opto-electronicsCollaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2023年第32卷第2期

页      面：242-249页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：supported by the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302003) the National Key Research and Development Program of China (Grant Nos. 2022YFA1404101, 2018YFA0307601,and 2021YFA1401700) the National Natural Science Foundation of China (Grant Nos. 12034011, 92065108, 11974224, 12022406, and 12004229) the Fund for Shanxi 1331 Project Key Subjects Construction 

主　　题：ultracold gases degenerate Bose–Fermi mixture 

摘      要：We report a compact experimental setup for producing a quantum degenerate mixture of Bose23Na and Fermi40K gases. The atoms are collected in dual dark magneto–optical traps(MOT) with species timesharing loading to reduce the light-induced loss, and then further cooled using the gray molasses technique on the D2line for23Na and D1line for40K. The microwave evaporation cooling is used to cool23Na in |F = 2, mF= 2〉 in an optically plugged magnetic trap, meanwhile,40K in |F = 9/2, mF= 9/2〉 is sympathetically cooled. Then the mixture is loaded into a large volume optical dipole trap where23Na atoms are immediately transferred to |1, 1〉 for further effective cooling to avoid the strong three-body loss between23Na atoms in |2, 2〉 and40K atoms in |9/2, 9/2〉. At the end of the evaporation in optical trap, a degenerate Fermi gas of40K with 1.9 × 10^(5) atoms at T/TF= 0.5 in the |9/2, 9/2〉 hyperfine state coexists with a Bose–Einstein condensate(BEC) of23Na with 8 × 10^(4) atoms in the |1, 1〉 hyperfine state at 300 n K. We also can produce the two species mixture with the tunable population imbalance by adjusting the 23Na magneto–optical trap loading time.