【摘要】 采用旋转波近似,讨论一维Klein-Gordon双原子链中的能隙呼吸子.在驻波边界条件下数值求解一维Klein-Gordon双原子链晶格振动的运动方程组,得到不同耦合系数、不同非线性系数以及不同原子质量比情况下的以重原子为中心的对称模能隙呼吸子.随着耦合系数的增大,原子之间的耦合作用增强,呼吸子的空间扩展范围增大;非线性作用越大,能隙呼吸子局域化越强;随着原子质量差的增大,呼吸子在空间越来越局域.更多还原

【Abstract】 The gap breathers (GBs) in a one-dimensional Klein-Gordon diatomic chain are studied under rotating-wave approximation (RWA). The analytical investigation of heavy-particle centered symmetric mode (HS mode) has been implemented under the boundary condition of standing waves. We examine the effects of the coupling constant, nonlinear constant and the mass ratio on the GBs. The GB profiles are sensitive to the coupling constant, nonlinear constant and the mass ratio. As the coupling constant increases, the GB profiles become broader. But, with the nonlinearity and the mass ratio increasing, the GB profiles appear more localized.更多还原