驱动场下二组份BEC原子的量子动力学

摘要

In this paper, the time evolution of the atomicity density of two-component Bose-einstein condensates (BEC) is studied and it is demonstrated that the evolution of condensate density in long time, which presents a typical quantum collapse and revival in a complex way, is rather different from that in short time. Furthermore,quantum collapse of the system and revival characteristic will not change within a fairly wide range of parameters. The influence of the Rabi frequency, the strength of the coupling drive and the initial value of the relative phase on the evolution properties of atomicity density are also discussed.%研究二组份BEC原子数密度的时间演化规律,研究结果表明原子数密度的长时间的动力学行为表现出与短时间动力学行为不同的结果,长时间范围内原子数密度演化呈现量子体系特有的崩塌-复苏现象,且在较大的参数变化范围内,体系的崩塌-复苏特性不会改变.此外,讨论了驱动场Rabi频率、驱动场与原子的耦合强度及BEC二组份初始相对位相差对原子数密度演化特性的影响规律.