Two-dimensional discrete gap breathers in a two-dimensional discrete diatomic Klein-Gordon lattice |
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| Authors: | XU Quan QIANG Tian |
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| Affiliation: | Department of Physics, Daqing Normal University, Daqing 163712Department of Physics, Beijing Normal University, Beijing 100875 |
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| Abstract: | We study the existence and stability of two-dimensional discrete breathers in a two-dimensional discrete diatomic Klein-Gordon lattice consisting of alternating light and heavy atoms, with nearest-neighbor harmonic coupling. Localized solutions to the corresponding nonlinear differential equations with frequencies inside the gap of the linear wave spectrum, i.e. two-dimensional gap breathers, are investigated numerically. The numerical results of the corresponding algebraic equations demonstrate the possibility of the existence of two-dimensional gap breathers with three types of symmetries, i.e., symmetric, twin-antisymmetric and single-antisymmetric. Their stability depends on the nonlinear on-site potential (soft or hard), the interaction potential (attractive or repulsive) and the center of the two-dimensional gap breathers (on a light or a heavy atom). |
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| Keywords: | 05 45 Xt 02 30 Jr 63 20 Pw 63 20 Ry |
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