两组分BECs在光晶格中的隧穿动力学及其周期调制效应  

Tunneling dynamics and periodic modulating of a two-component BECs in optical lattices

作　　者：张科智[1] 王建军[1] 刘国荣[1] 薛具奎[1] 

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《物理学报》2010年第5期2952-2961,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10774120;10975114);甘肃省自然科学基金(批准号:3ZS051-A25-013);西北师范大学科技创新项目(批准号:NWNU-KJCXGC-03-17;NWNU-KJCXGC-03-48)资助的课题~~

摘　　要：研究了两组分玻色-爱因斯坦凝聚体(BECs)在一维光晶格中的隧穿动力学及周期调制效应.在两模近似下,运用数值分析的方法,讨论了两组分间相互作用对体系的隧穿动力学行为的影响.进一步讨论了两组分间相互作用在周期调制下系统的动力学特性,分析了随着调制振幅和频率的变化,系统发生隧穿、不稳定和自俘获的区域分布,发现在中低频调制下,系统的隧穿动力学发生了明显的改变.The tunneling dynamics and periodic modulation effect of a two-component Bose-Einstein condensate in an one-dimensional optical lattice are investigated. By using the two-mode approximation,we study the influence of the interaction between two-component BECs on the tunnelling dynamics of the system numerically. The dynamic behavior of the system is investigated by adding a periodic modulation on the interaction between two-component atoms. We get the region for the onset of the tunneling,unstability and the self-trapping of the system with the changing modulation amplitude and frequency. We find that for the intermediate-and the low-frequency modulations,the dynamic behaviors of the system are dramatically different.

关 键 词：两组分BECs 光晶格 隧穿动力学 不规则振荡 

分 类 号：O482.1[理学—固体物理]