摘要
本文研究原子间的线性和非线性相互作用对两个原子玻色爱因斯坦凝聚(BEC)系统中的隧穿动力学的影响.这两个BEC初始处于相干态.我们详细研究了这类隧穿动力学的短时间(在凝聚的相干时间内)行为.发现由原子隧穿导致的两个凝聚间的布居差表现出周期性的拉比振荡,其振荡周期不仅依赖于原子间的相互作用,还取决于系统的初态.我们表明在一定条件下此系统可达到一个自囚禁的稳态.我们还研究了两个凝系间的隧穿原子流,发现在一定条件下可获得一个只含纯直流的原子流.
In this paper, we study the influence of the interatomic linear and nonlinear interactions on tunneling dynamics in two zerotemperature BoseEinstein condensates (BECs) when the two BECs are in coherent states. The shorttime behaviors of the tunneling dynamics are investigated in detail. It is found that the population difference between two BECs exhibits periodic Rabbi oscillations with a period, which depends upon not only interatomic linear and nonlinear interactions but also the initial state of two BECs. We show that the twoBEC system may reach a selftrapping stationary state through adjusting interatomic interactions and the initial state of the system under our consideration. We also investigate the coherent atomic tunneling current between BECs, and find that under certain conditions coherent atomic tunneling current may be a pure DC atom current.
出处
《郴州师范高等专科学校学报》
2003年第2期35-39,共5页
Journal of Chenzhou Teachers College
