Atomic transport dynamics in crossed optical dipole trap

doi:10.1088/1674-1056/ad401c

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.

Keywords: cold atom crossed optical dipole trap transport process

Received: 06 March 2024
Revised: 03 April 2024
Accepted manuscript online: 18 April 2024

PACS:	37.10.De	(Atom cooling methods)
	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)

Fund: 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.

Corresponding Authors: Xiaoji Zhou
E-mail: xjzhou@pku.edu.cn

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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 2024 Chin. Phys. B 33 073701

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Atomic transport dynamics in crossed optical dipole trap

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