非对称双势阱中准一维物质波包的输运

Transport of Quasi-one-Dimensional Matter Wavepacket Trapped in an Unsymmetrical Double-Well

文章研究非对称双势阱中准一维玻色-爱因斯坦凝聚体在时空调制原子间的相互作用下的动力学行为.通过分析求解得到相应定态系统的高斯波包型解,并数值地展示时空变化的相互作用对物质波包运动方向的控制.发现物质波包随着调制幅度的增加塌缩时间提前;当调制频率增加到高频区域,在调制幅度不大的情况下,物质波包呈现近保真现象.有趣的是,通过调节原子间相互作用可以控制原子波包运动到势能较高的阱.

We investigate the dynamics of a quasi-one-dimensional Bose-Einstein condensate confined in an unsymmetrical double-well potential with spatiotemporally modulated interaction. After the Gaussian wavepacket solution obtained by analytical method, the controlling and chaos of the matter wavepacket are demonstrated numerically. We found that this system enters chaos with increasing of modulating amplitude. When modulating frequency increases to high but modulating amplitude isn＇ t too large, the matter wavepacket appears near-fidelity. It is interesting that the atomic wavepacket can move to the higher- energy well by adjusting the atomic interaction.