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arXiv 0812.1924nlin.PSphysics.optics
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晶格势对二维孤子和涡旋超临界坍缩的稳定作用

Stabilization of two-dimensional solitons and vortices against supercritical collapse by lattice potentials

Rodislav Driben, Boris A. Malomed

摘要:

光格势可以稳定孤子和孤波涡,使其不受由二维几何中的立方吸引非线性引起的临界坍缩的影响。我们表明,OL也可以稳定各种基本和涡旋孤子对超临界崩溃,驱动的双吸引力的五阶非线性(然而,孤子保持不稳定的情况下,纯五阶非线性)。被认为是两种类型的OL,产生类似的结果:二维Kronig-Penney“棋盘”,和正弦电位。孤子族是通过变分近似得到的,并作为数值解。族的稳定性,其中包括基本和多峰孤子,斜直型涡,四极涡,和超涡,严格遵守Vakhitov-Kolokolov准则。该模型适用于光学介质和“煎饼”陷阱中的BEC。

英文摘要:

It is known that optical-lattice (OL) potentials can stabilize solitons and solitary vortices against the critical collapse, generated by the cubic attractive nonlinearity in the 2D geometry. We demonstrate OLs can also stabilize various species of fundamental and vortical solitons against the super-critical collapse, driven by the double-attractive cubic-quintic nonlinearity (however, solitons remain unstable in the case of the pure quintic nonlinearity). Two types of OLs are considered, producing similar results: the 2D Kronig-Penney "checkerboard", and the sinusoidal potential. Soliton families are obtained by means of a variational approximation, and as numerical solutions. The stability of the families, which include fundamental and multi-humped solitons, vortices of oblique and straight types, vortices built of quadrupoles, and supervortices, strictly obeys the Vakhitov-Kolokolov criterion. The model applies to optical media and BEC in "pancake" traps.

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