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arXiv 2008.07866nlin.PSphysics.optics
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分数阶非线性Schroedinger方程中单峰和多峰孤子的稳定性

Stabilization of single- and multi-peak solitons in the fractional nonlinear Schroedinger equation with a trapping potential

Yunli Qiu, Boris A. Malomed, Dumitru Mihalache, Xing Zhu, Xi Peng, Yingji He

摘要:

在分数阶非线性薛定谔方程(FNSE)的框架下,讨论了具有聚焦立方或聚焦-散焦双五阶非线性和约束谐振子(HO)势的局域模的存在性和稳定性.近似解析解的形式厄米高斯模式。线性稳定性分析和直接模拟结果表明,在立方自聚焦作用下,当Levy指数(分形度)α = 1和α < 1时,单峰值基态和偶极模被HO势稳定,分别导致自由空间中的临界或超临界坍缩.除此之外,包含五阶自散焦提供了高阶模式的稳定性,其中局部峰的数量至少高达七个。

英文摘要:

We address the existence and stability of localized modes in the framework of the fractional nonlinear Schroedinger equation (FNSE) with the focusing cubic or focusing-defocusing cubic-quintic nonlinearity and a confining harmonic-oscillator (HO) potential. Approximate analytical solutions are obtained in the form of Hermite-Gauss modes. The linear stability analysis and direct simulations reveal that, under the action of the cubic self-focusing, the single-peak ground state and dipole mode are stabilized by the HO potential at values of the Levy index (the fractionality degree) alpha = 1 and alpha < 1, which lead, respectively, to the critical or supercritical collapse in free space. In addition to that, the inclusion of the quintic self-defocusing provides stabilization of higher-order modes, with the number of local peaks up to seven, at least.

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