球对称玻色—爱因斯坦凝聚中表面模的朗道阻尼和频移  

Landau Damping and Frequency-shift of Surface Mode in a Spherical Bose-Einstein Condensate

作　　者：符豫东 马瑞[1] 马晓栋[1] 

机构地区：[1]新疆师范大学物理与电子工程学院,新疆乌鲁木齐830054

出　　处：《新疆师范大学学报（自然科学版）》2016年第4期39-44,共6页Journal of Xinjiang Normal University(Natural Sciences Edition)

基　　金：国家自然科学基金项目(11264039)

摘　　要：文章采用平均场理论近似研究球对称玻色-爱因斯坦凝聚中的朗道阻尼和频移,解析计算阻尼系数和频移大小及其他们的温度依赖,在计算平均场理论微扰公式中考虑元激发的弛豫及其正交关系,在解析方案中取基态波函数为高斯分布函数一级近似改进托马斯-费米近似,以期理论结果对预言实验现象有一定的参考价值。The Landau damping and frequency-shift of surface mode in a spherical Bose-Einstein condensate are investigated by using the mean-field theory approximation. The damping rate and frequency-shift magnitude and their temperature dependence are analytically calculated. The relaxation and the orthogonal relation of elementary excitation are taken into account in the mean-field perturbation formula. The first approximation of Gaussian distribution function is taken as the ground state wavefunction to improve the Tomas-Fermi approximation in the analytic scheme. We expect that our theoretic calculation is helpful for experimental research.

关 键 词：玻色-爱因斯坦凝聚 朗道阻尼和频移 哈特-福克-博戈留波夫近似 托马斯-费米近似 

分 类 号：O415[理学—理论物理]