Atomic transport dynamics in crossed optical dipole trap

doi:10.1088/1674-1056/ad401c

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 73701-073701.doi: 10.1088/1674-1056/ad401c

Atomic transport dynamics in crossed optical dipole trap

Peng Peng(彭鹏)¹, Zhengxi Zhang(张正熙)¹, Yaoyuan Fan(樊耀塬)¹, Guoling Yin(殷国玲)³, Dekai Mao(毛德凯)¹, Xuzong Chen(陈徐宗)¹, Wei Xiong(熊炜)¹, and Xiaoji Zhou(周小计)^1,2,3,†

1 State Key Laboratory of Advanced Optical Communication System and Network, School of Electronics, Peking University, Beijing 100871, China;
2 Institute of Carbon-based Thin Film Electronics, Peking University, Taiyuan 030012, China;
3 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

收稿日期:2024-03-06 修回日期:2024-04-03 接受日期:2024-04-18 出版日期:2024-06-18 发布日期:2024-06-20
通讯作者: Xiaoji Zhou E-mail:xjzhou@pku.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 92365208, 11934002, and 11920101004), the National Key Research and Development Program of China (Grant Nos. 2021YFA0718300 and 2021YFA1400900), the Science and Technology Major Project of Shanxi (Grant No. 202101030201022), and the Space Application System of China Manned Space Program.

Atomic transport dynamics in crossed optical dipole trap

1 State Key Laboratory of Advanced Optical Communication System and Network, School of Electronics, Peking University, Beijing 100871, China;
2 Institute of Carbon-based Thin Film Electronics, Peking University, Taiyuan 030012, China;
3 State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006, China

Received:2024-03-06 Revised:2024-04-03 Accepted:2024-04-18 Online:2024-06-18 Published:2024-06-20
Contact: Xiaoji Zhou E-mail:xjzhou@pku.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 92365208, 11934002, and 11920101004), the National Key Research and Development Program of China (Grant Nos. 2021YFA0718300 and 2021YFA1400900), the Science and Technology Major Project of Shanxi (Grant No. 202101030201022), and the Space Application System of China Manned Space Program.

摘要/Abstract

摘要： We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss. The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.

关键词: cold atom, crossed optical dipole trap, transport process

Abstract: We study the dynamical evolution of cold atoms in crossed optical dipole trap theoretically and experimentally. The atomic transport process is accompanied by two competitive kinds of physical mechanics, atomic loading and atomic loss. The loading process normally is negligible in the evaporative cooling experiment on the ground, while it is significant in preparation of ultra-cold atoms in the space station. Normally, the atomic loading process is much weaker than the atomic loss process, and the atomic number in the central region of the trap decreases monotonically, as reported in previous research. However, when the atomic loading process is comparable to the atomic loss process, the atomic number in the central region of the trap will initially increase to a maximum value and then slowly decrease, and we have observed the phenomenon first. The increase of atomic number in the central region of the trap shows the presence of the loading process, and this will be significant especially under microgravity conditions. We build a theoretical model to analyze the competitive relationship, which coincides with the experimental results well. Furthermore, we have also given the predicted evolutionary behaviors under different conditions. This research provides a solid foundation for further understanding of the atomic transport process in traps. The analysis of loading process is of significant importance for preparation of ultra-cold atoms in a crossed optical dipole trap under microgravity conditions.

Key words: cold atom, crossed optical dipole trap, transport process

中图分类号: (Atom cooling methods)

37.10.De

05.60.-k (Transport processes) 37.10.Gh (Atom traps and guides) 42.50.Wk (Mechanical effects of light on material media, microstructures and particles)

Peng Peng(彭鹏), Zhengxi Zhang(张正熙), Yaoyuan Fan(樊耀塬), Guoling Yin(殷国玲), Dekai Mao(毛德凯), Xuzong Chen(陈徐宗), Wei Xiong(熊炜), and Xiaoji Zhou(周小计). Atomic transport dynamics in crossed optical dipole trap[J]. 中国物理B, 2024, 33(7): 73701-073701.

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Atomic transport dynamics in crossed optical dipole trap

Atomic transport dynamics in crossed optical dipole trap

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