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arXiv 1008.2178nlin.PS
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一维局域耦合晶格系统中的界面孤子

Interface solitons in one-dimensional locally-coupled lattice systems

Lj. Hadzievski, G. Gligoric, A. Maluckov, B. A. Malomed

摘要:

研究了钉扎在两个单点耦合的离散晶格界面上的基孤子。在一维空间中考虑了具有自吸引在位立方非线性的串联和并联耦合全同链(\textit{System 1}和\textit{System 2})。在这两个系统中,它可以很容易地实现为阵列的非线性光波导,对称,反对称和非对称孤子的变分近似(VA)和数值方法进行了研究。结果表明,在整个耦合参数空间中存在反对称孤子,而在耦合参数的某一临界值以下,可以发现对称和非对称模式。数值结果证实了这些预测的对称和非对称的基本模式。数值计算得到的反对称孤子的存在区域也受耦合参数的限制。在两个系统中,对称孤子都通过超临界分叉失稳,从而产生稳定的非对称孤子。反对称基孤子不发生分叉,稳定与否都有可能。在双稳区,稳定的反对称孤子与对称或非对称孤子共存。

英文摘要:

Fundamental solitons pinned to the interface between two discrete lattices coupled at a single site are investigated. Serially and parallel-coupled identical chains (\textit{System 1} and \textit{System 2}), with the self-attractive on-site cubic nonlinearity, are considered in one dimension. In these two systems, which can be readily implemented as arrays of nonlinear optical waveguides, symmetric, antisymmetric and asymmetric solitons are investigated by means of the variational approximation (VA) and numerical methods. The VA demonstrates that the antisymmetric solitons exist in the entire parameter space, while the symmetric and asymmetric modes can be found below some critical value of the coupling parameter. Numerical results confirm these predictions for the symmetric and asymmetric fundamental modes. The existence region of numerically found antisymmetric solitons is also limited by a certain value of the coupling parameter. The symmetric solitons are destabilized via a supercritical symmetry-breaking pitchfork bifurcation, which gives rise to stable asymmetric solitons, in both systems. The antisymmetric fundamental solitons, which may be stable or not, do not undergo any bifurcation. In bistability regions stable antisymmetric solitons coexist with either symmetric or asymmetric ones.

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