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

doi:10.1088/1674-1056/aca14f

中国物理B ›› 2023, Vol. 32 ›› Issue (2): 23701-023701.doi: 10.1088/1674-1056/aca14f

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

收稿日期:2022-09-20 修回日期:2022-11-04 接受日期:2022-11-09 出版日期:2023-01-10 发布日期:2023-01-31
通讯作者: Pengjun Wang, Jing Zhang E-mail:pengjun_wang@sxu.edu.cn;jzhang74@yahoo.com,jzhang74@sxu.edu.cn
基金资助:
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.

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

Received:2022-09-20 Revised:2022-11-04 Accepted:2022-11-09 Online:2023-01-10 Published:2023-01-31
Contact: Pengjun Wang, Jing Zhang E-mail:pengjun_wang@sxu.edu.cn;jzhang74@yahoo.com,jzhang74@sxu.edu.cn
Supported by:
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.

摘要/Abstract

摘要： 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.

关键词: ultracold gases, degenerate Bose-Fermi mixture

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.

Key words: ultracold gases, degenerate Bose-Fermi mixture

中图分类号: (Atom cooling methods)

37.10.De

37.10.Gh (Atom traps and guides) 67.85.-d (Ultracold gases, trapped gases) 37.20.+j (Atomic and molecular beam sources and techniques)

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[J]. 中国物理B, 2023, 32(2): 23701-023701.

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[J]. Chin. Phys. B, 2023, 32(2): 23701-023701.

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

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

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