运用分子动力学模拟方法研究了在只驱动一个边界粒子时交变力的振幅和频率对Shapiro台阶的影响.研究结果表明:在台阶宽度和临界力的振幅依赖性中,出现非Bessel形式的振荡行为;在台阶宽度和临界力的频率依赖性中,在高振幅区域,振荡行为也出现,但随着频率的增加,振荡行为消失.
The method of molecular-dynamics simulation is used to study the effects of the amplitude and freqency of ac-force to Shapiro steps,only when one boundary particle is driven in the paper.It is shown that the step width and critical depinning force exhibit non-Bessel oscillatory behavior at the amplitude dependence.For the frequency dependence,it is found that in the higher regimes,ocillations will occur at low values of frequency.The phenomenon disapper as the frequency increases.