振幅相位调制驻波光场中冷却原子的动力学局域

Dynamical investigation on momentum spread of two-level atom by an amplitude-modulated and phase-modulated standing light wave

分析了二能级原子在振幅相位调制驻波场作用下动量扩散模型 ,这是一个双频参数激励的非线性量子单摆模型。这个系统在经典极限下表现混沌行为 ,在相同参数条件下 ,这个系统具有动力学局域特征 ,具有两个不可约频率扰动的系统的局域长度要比单个频率扰动时大得多。

In this paper the model of two level atomic momentum spread in amplitude and phase modulated standing light wave was investigated. this is a nonlinear quantum pendulum driven by a time dependent perterbation with two frequencies. This system shows chaotic behaviour in the classical limit. The system exists the characteristic of dynamical localization for the same parameters as that in the classical model correspoinding to it. Localization length of the system with two incommensurate perturbing frequency is much larger than that of the system with one perturbing frequency.