驱动两能级系统中的振动共振

Vibrational resonance in a driven two-level system

考虑了一个两能级系统在高频驱动力作用下对一个低频驱动的隧穿响应,通过数值求解系统的动力学方程发现,当高频驱动力的幅度取某些特殊值时,隧穿响应将出现一系列离散的共振峰.在高频近似下得到了系统的有效动力学方程,从而分析得到了系统出现振动共振的条件,它很好地吻合了数值分析的结果.

The effect of a high-frequency force on the tunneling response of a two-level system to a low-frequency force is considered analytically and numerically. By numerically solving the dynamical equations, it is found that the tunneling response can display a series of discrete peaks at particular values of the high-frequency driving amplitude. Under the high-frequency approximation, an effective equation for this system is obtained, and thus the condition for the occurrence of the resonance is derived. It can match well with the numerical results.