采用线性稳定性分析的方法,讨论了一维β-FPU双原子链中呼吸子解的稳定性问题.首先在驻波边界条件下数值求解一维β-FPU双原子链晶格振动的方程组,得到了存在于该模型中的能隙呼吸子随时空演化的图形.此后引入线性稳定性分析方法,将其运用到一维β-FPU双原子链模型中,得到无论是非线性系数β〉0(硬非线性情况)还是β〈0时(软非线性情况),呼吸子解都是临界稳定存在的.
Discrete gap breathers (DGBS) in a one-dimensional diatomic β-FPU chain are studied by linear stability analysis. Under the conditions of standing wave boundary, gap breather solutions of complete equations for motion are calculated numerically, clear time-space figure of DGB is obtained. Linear stability analysis in a one-dimensional diatomic β-FPU chain was also used. Gap breathers in the model is critical stable whether the quartic nonlinearity effect is soft or hard.