Atomic transport dynamics in crossed optical dipole trap  

作　　者：彭鹏 张正熙 樊耀塬 殷国玲 毛德凯 陈徐宗 熊炜 周小计 Peng Peng;Zhengxi Zhang;Yaoyuan Fan;Guoling Yin;Dekai Mao;Xuzong Chen;Wei Xiong;and Xiaoji Zhou(State Key Laboratory of Advanced Optical Communication System and Network,School of Electronics,Peking University,Beijing 100871,China;Institute of Carbon-based Thin Film Electronics,Peking University,Taiyuan 030012,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,Chin)

机构地区：[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

出　　处：《Chinese Physics B》2024年第7期293-301,共9页中国物理B（英文版）

基　　金：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);the Space Application System of China Manned Space Program。

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 

分 类 号：O562[理学—原子与分子物理]