Periodic, quasiperiodic and chaotic discrete breathers in a parametrical driven two-dimensional discrete diatomic Klein--Gordon lattice |
| |
Authors: | Xu Quan and Tian Qiang |
| |
Affiliation: | Department of Physics, Daqing Normal University, Daqing 163712, China; Department of Physics, Beijing Normal University, Beijing 100875, China |
| |
Abstract: | We study a two-dimensional (2D) diatomic lattice of anharmonicoscillators with only quartic nearest-neighbor interactions, inwhich discrete breathers (DBs) can be explicitly constructed by anexact separation of their time and space dependence. DBs can stablyexist in the 2D discrete diatomic Klein--Gordon lattice with hardand soft on-site potentials. When a parametric driving term isintroduced in the factor multiplying the harmonic part of theon-site potential of the system, we can obtain the stablequasiperiodic discrete breathers (QDBs) and chaotic discretebreathers (CDBs) by changing the amplitude of the driver. But theDBs and QDBs with symmetric and anti-symmetric profiles that arecentered at a heavy atom are more stable than at a light atom,because the frequencies of the DBs and QDBs centered at a heavy atomare lower than those centered at a light atom. |
| |
Keywords: | discrete breather quasi-periodic discrete breather chaotic discrete breather two-dimensional discrete diatomic Klein--Gordon lattice |
本文献已被 维普 等数据库收录! |
| 点击此处可从《中国物理 B》浏览原始摘要信息 |
|
点击此处可从《中国物理 B》下载免费的PDF全文 |
|