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

doi:10.1088/1674-1056/ad334d

中国物理B ›› 2024, Vol. 33 ›› Issue (6): 63402-063402.doi: 10.1088/1674-1056/ad334d

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

Peibo Ding(丁培波)¹, Biao Shan(单标)¹, Yuhang Zhao(赵宇航)¹, Yajing Yang(杨雅婧)¹, Liangchao Chen(陈良超)^1,2, Zengming Meng(孟增明)^1,2, Pengjun Wang(王鹏军)^1,2, and Lianghui Huang(黄良辉)^1,2,†

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

收稿日期:2024-02-03 修回日期:2024-02-26 接受日期:2024-03-13 出版日期:2024-06-18 发布日期:2024-06-18
通讯作者: Lianghui Huang E-mail:huanglh06@sxu.edu.cn
基金资助:
This research was 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), and the Fund for Shanxi 1331 Project Key Subjects Construction.

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

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

Received:2024-02-03 Revised:2024-02-26 Accepted:2024-03-13 Online:2024-06-18 Published:2024-06-18
Contact: Lianghui Huang E-mail:huanglh06@sxu.edu.cn
Supported by:
This research was 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), and the Fund for Shanxi 1331 Project Key Subjects Construction.

摘要/Abstract

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 $|F=9/2, m_{\scriptscriptstyle{\rm F}}=9/2\rangle$ of $^{40}$K and $|1, 1\rangle$ of $^{87}$Rb in the ODT, which is larger and longer compared with the combination of the spin state $|9/2, 9/2\rangle$ of $^{40}$K and $|2, 2\rangle$ 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 ($\sim6\times10^{6}$) or the mixtures of atoms with an equal number ($\sim1.6\times10^{6}$) 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 ($8\times10^{6}$) and higher degeneracy ($T/T_{\scriptscriptstyle{\rm F}}=0.25$) 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

Abstract: 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 $|F=9/2, m_{\scriptscriptstyle{\rm F}}=9/2\rangle$ of $^{40}$K and $|1, 1\rangle$ of $^{87}$Rb in the ODT, which is larger and longer compared with the combination of the spin state $|9/2, 9/2\rangle$ of $^{40}$K and $|2, 2\rangle$ 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 ($\sim6\times10^{6}$) or the mixtures of atoms with an equal number ($\sim1.6\times10^{6}$) 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 ($8\times10^{6}$) and higher degeneracy ($T/T_{\scriptscriptstyle{\rm F}}=0.25$) 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.

Key words: optical dipole trap, Bose and Fermi gas mixtures, atomic lifetime

中图分类号: (Mixtures of Bose and Fermi gases)

67.85.Pq

37.10.Jk (Atoms in optical lattices) 03.75.Ss (Degenerate Fermi gases) 34.50.Cx (Elastic; ultracold collisions)

Peibo Ding(丁培波), Biao Shan(单标), Yuhang Zhao(赵宇航), Yajing Yang(杨雅婧), Liangchao Chen(陈良超), Zengming Meng(孟增明), Pengjun Wang(王鹏军), and Lianghui Huang(黄良辉). Optimal preparation of Bose and Fermi atomic gas mixtures of ⁸⁷Rb and ⁴⁰K in a crossed optical dipole trap[J]. 中国物理B, 2024, 33(6): 63402-063402.

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

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

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