MOVING NONLINEAR LOCALIZED MODES FOR ONE DIMENSIONAL KLEIN-GORDON DIATOMIC LATTICE

• 来源期刊: 中国物理(英文版)
• 学科: 物理学
• 关键词: diatomic lattice localized modes semi-discrete approximation
• 年，卷（期）: 2001,（8）
• 页码范围: 689-693
• 页数: 5页
• 分类号: O4
• 语种: 英文

摘要

We study analytically the moving nonlinear localized vibrational modes (discrete breathers) for a one-dimensional Klein-Gordon diatomic lattice in the whole ω(q) plane of the system by means of a semi-discrete approximation, in which the carrier wave of the modes is treated explicitly while the envelope is described in the continuum approximation.We find that both pulse and kink envelope moving modes for this lattice system can occur with certain carrier wave vectors and vibrational frequencies in separate regions of the ω(q) plane. However, the kink envelope moving modes have not been reported previously for this lattice system.