The spin evolution of spin-3 ^(52)Cr Bose-Einstein condensate  

作　　者：司徒树平 贺彦章 

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,and School of Physics and Engineering,Sun Yat-Sen University

出　　处：《Chinese Physics B》2011年第1期157-164,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.10874249 and 11075223)

摘　　要：This paper studies theoretically the spin evolution of a Bose-Einstein condensate starting from a mixture of two or three groups of 52Cr （spin-3） atoms in an optical trap. The initial state is so chosen that the condensate has total magnetization zero so that the system does not distinguish up and down. It is assumed that the system is very dilute （particle number is very small）, the temperature is very low, and the frequency of the harmonic trap is large enough. In these situations, the deviation caused by the neglect of the dipole-dipole interaction and by using the single-mode approximation is reduced. A theoretical calculation beyond the mean field theory is performed and the numerical results are helpful for the evaluation of the unknown strength go.This paper studies theoretically the spin evolution of a Bose-Einstein condensate starting from a mixture of two or three groups of 52Cr （spin-3） atoms in an optical trap. The initial state is so chosen that the condensate has total magnetization zero so that the system does not distinguish up and down. It is assumed that the system is very dilute （particle number is very small）, the temperature is very low, and the frequency of the harmonic trap is large enough. In these situations, the deviation caused by the neglect of the dipole-dipole interaction and by using the single-mode approximation is reduced. A theoretical calculation beyond the mean field theory is performed and the numerical results are helpful for the evaluation of the unknown strength go.

关 键 词：Bose-Einstein condensate spin evolution short-ranged interaction strength 

分 类 号：O469[理学—凝聚态物理]