玻色凝聚气体对外部扰动的响应  

Response of Bose-condensed Gas to Some External Disturbance

作　　者：冯晓霞 刘渊[2] 李卫东[2] 

机构地区：[1]山西综合职业技术学院,山西太原030006 [2]山西大学理论物理研究所,山西太原030006

出　　处：《山西大学学报（自然科学版）》2009年第1期49-52,共4页Journal of Shanxi University(Natural Science Edition)

基　　金：山西省自然科学基金(2006011004)

摘　　要：通过数值方法对流体力学方程进行求解,研究了被束缚在三维轴对称谐振子势中玻色凝聚气体的元激发的振动行为.研究发现,当外部扰动为正弦扰动时元激发的振动则按正弦规律变化;当外部扰动为随机扰动时其振动变的毫无规律,然而在某一时刻(t=20)撤去所有扰动后,凝聚体将回到稳定的振动状态.同时还讨论了x和y方向上扰动满足一定关系时,这两个方向上元激发的振动之间的相互关系.We investigated the behavior of collective excitations for a Bose-condensed gas trapped by a 3D axially symmetric harmonic potential at zero temperature by numerical solving the equations of hydrodynamics for collective modes. We found that the oscillation is sinusoidal under the external sinusoidal disturbance, and the random oscillation under the external stochastic disturbance. As long as we remove all disturbances at t = 20 , the collective modes will recover the regular oscillations. Furthermore, we studied the oscillations along the x and y direction when the external disturbance satisfy a certain relation.

关 键 词：玻色凝聚 元激发 流体力学方程 

分 类 号：O413.1[理学—理论物理]