驱动场作用下二分量BEC原子数密度演化中的崩塌与复苏现象

long-time evolution of the condensate density's collapse and revival in two-component bose-einstein condensates with a coupling drive

本文运用数值模拟研究了二分量BEC原子数密度的长时间动力学行为,讨论了驱动场Rabi频率、二分量初始相对相位差、驱动场耦合强度、同分量内原子作用强度及不同分量间原子作用强度对阱中原子数密度演化特性的影响.结果表明:长时间内阱中原子数密度的演化出现与短时间内周期性余弦振荡不同的新现象,即呈现典型的量子崩塌与复苏.

Using the numerical calculation, we have investigated the long-time evolution of atomicity density of two-component BEC,and have found that the evolution of condensate density in long time, which presents a typical quantumn collapse and revival with a complex period, is rather different from that in short time, which displays a regular cosine oscillation. Futhermore, we have also discussed the influence of the Rabi frequency of coupling drive field, various values for the relative phase, the strength of the coupling drive, the strength of the interatomic interaction in each condensate and the strength of the interspecies interaction on the evolution properties of atomicity density.