光学学报, 2010, 30 (3): 893, 网络出版: 2010-03-11
原子吸收成像的二维光学密度分布获得量子简并费米气体参数
Obtaining the Parameter of Degenerate Fermi Gas from Two-Dimensional Optical Density Distribution of Absorption Images
简并费米气体 托马斯费米近似 费米温度 费米简并气体参数 degenerate Fermi gas Thomas-Fermi approximation Fermi temperature degeneracy parameter of Fermi gas
摘要
从费米原子俘获在谐振势中出发,采用托马斯费米的半经典近似(Thomas-Fermi approximation),计算了自旋极化费米子的空间分布函数,对费米原子吸收成像的光学密度分布进行拟合,分析得到粒子数,费米温度和实际温度。采用这种方法,对实验中获得的40K费米原子吸收成像的光学密度分布进行拟合,得到了费米气体量子简并参数T/TF。
Abstract
The three dimensional density distribution of a spin-polarized Fermi gas in a harmonic magnetic trap is calculated by using the Tomas-Fermi approximation. By fit the optical density distribution of absorption imaging,the total atom number,Fermi temperature and the actual temperature of the gas may be extracted. According this method,the optical density distribution of absorption imaging of degenerate fermions 40K in our experiment is fitted to obtain quantum degeneracy parameter T/TF of the Fermi gas.
王鹏军, 熊德智, 陈海霞, 张靖. 原子吸收成像的二维光学密度分布获得量子简并费米气体参数[J]. 光学学报, 2010, 30(3): 893. Wang Pengjun, Xiong Dezhi, Chen Haixia, Zhang Jing. Obtaining the Parameter of Degenerate Fermi Gas from Two-Dimensional Optical Density Distribution of Absorption Images[J]. Acta Optica Sinica, 2010, 30(3): 893.
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