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Quantum degenerate Bose-Fermi atomic gas mixture of 23Na and 40K |
| Ziliang Li(李子亮), Zhengyu Gu(顾正宇), Zhenlian Shi(师振莲), Pengjun Wang(王鹏军)†, and Jing Zhang(张靖)‡ |
| 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 |
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Abstract We report a compact experimental setup for producing a quantum degenerate mixture of Bose $^{23}$Na and Fermi $^{40}$K 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 $D_{2}$ line for $^{23}$Na and $D_{1}$ line for $^{40}$K. The microwave evaporation cooling is used to cool $^{23}$Na in $| F=2,m_{F}=2\rangle$ in an optically plugged magnetic trap, meanwhile, $^{40}$K in $| F=9/2,m_{F}=9/2\rangle$ is sympathetically cooled. Then the mixture is loaded into a large volume optical dipole trap where $^{23}$Na atoms are immediately transferred to $|1,1\rangle$ for further effective cooling to avoid the strong three-body loss between $^{23}$Na atoms in $|2,2\rangle$ and $^{40}$K atoms in $|9/2,9/2\rangle$. At the end of the evaporation in optical trap, a degenerate Fermi gas of $^{40}$K with $1.9 \times10^{5}$ atoms at $T/T_{F}=0.5$ in the $|9/2,9/2\rangle$ hyperfine state coexists with a Bose-Einstein condensate (BEC) of $^{23}$Na with $8\times10^{4}$ atoms in the $|1,1\rangle$ hyperfine state at 300 nK. We also can produce the two species mixture with the tunable population imbalance by adjusting the $^{23}$Na magneto-optical trap loading time.
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Received: 20 September 2022
Revised: 04 November 2022
Accepted manuscript online: 09 November 2022
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PACS:
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37.10.De
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(Atom cooling methods)
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37.10.Gh
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(Atom traps and guides)
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67.85.-d
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(Ultracold gases, trapped gases)
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37.20.+j
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(Atomic and molecular beam sources and techniques)
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| Fund: Project 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), and the Fund for Shanxi 1331 Project Key Subjects Construction. |
Corresponding Authors:
Pengjun Wang, Jing Zhang
E-mail: pengjun_wang@sxu.edu.cn;jzhang74@yahoo.com,jzhang74@sxu.edu.cn
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Cite this article:
Ziliang Li(李子亮), Zhengyu Gu(顾正宇), Zhenlian Shi(师振莲), Pengjun Wang(王鹏军), and Jing Zhang(张靖) Quantum degenerate Bose-Fermi atomic gas mixture of 23Na and 40K 2023 Chin. Phys. B 32 023701
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