驱动场作用下二分量BEC中原子数密度的演化  

Time Evolution of the Condensate Density of Two-component Bose-Einstein Condensations with a Coupling Drive

作　　者：刘志荣[1] 刘正东[1] 张丽英[1] 谢应茂[1] 

机构地区：[1]南昌大学近代物理研究所,江西南昌330047

出　　处：《量子光学学报》2005年第4期161-163,共3页Journal of Quantum Optics

基　　金：国家自然科学基金(批准号:10464002和60278016)

摘　　要：运用数值模拟研究了二分量玻色-爱因斯坦凝聚体(BEC)原子数密度的动力学行为,讨论了驱动场耦合强度、不同分量间原子作用强度、射频场频率及同分量内原子作用强度对二分量原子数密度演化特性的影响。结果显示原子数密度随时间近似作周期性振荡,其振荡的周期随驱动耦合场强度、不同分量原子间作用强度的增大而减小,随自耦合强度的增大而增大;射频场频率的变化并不显著改变原子数密度振荡的周期,但它的增大会和自耦合强度的增大一样导致原子密度振荡的振幅减小。With the numerical calculation method we investigated the dynamics of two-component Bose-Einstein condensates （BEC） with coupling drive with the explicit expression of the second atomicity density, and we also discussed the influence of the strength of the coupling drive, the strength of interspecies interaction, the rf frequencies and the strength of the interaction in each condensate on the evolution properties of atomicity density. Our results demonstrate that atomicity density fluctuates like a sinusoidal function of time approximately. And it is clear that with the increace of strength of coupling drive or the strength of interspecies interaction, the period of oscillation of the atomicity density decreases. However, the period increases with the increase of the strength of the interaction in each condensate. Furthermore, the change of the rf frequencies does not affect fluctuation＇s period seriously, and both the increase of the rf frequencies and the strength of the interaction in each condenstate will result in the decrease of the amplitude of oscillation.

关 键 词：二分量玻色-爱因斯坦凝聚体(BEC) 耦合驱动 射频场 

分 类 号：O431[机械工程—光学工程]