arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.1702physics.opticscond-mat.quant-gasnlin.PS
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一维和二维系统中自聚焦和自散焦非线性之间竞争的空间控制

Spatial control of the competition between self-focusing and self-defocusing nonlinearities in one- and two-dimensional systems

Nguyen Viet Hung, Marek Trippenbach, Eryk Infeld, Boris A. Malomed

摘要:

我们引入了一个系统的竞争自聚焦(SF)和自散焦(SDF)的条款,它们具有相同的缩放尺寸。在一维(1D)系统中,该设置由SF三次项乘以δ函数$δ(x)$和空间均匀SDF五次项的组合提供。这个系统产生了最一般的1D-Townes孤子族,整个家庭是不稳定的。然而,它是完全稳定的有限宽度正则化的$δ$功能。结果是通过数值和分析方法。我们还考虑了系统的对称对正则化的$δ$ -功能,从而产生了丰富的对称,反对称,和非对称孤子,连接的分叉环,占打破和恢复的对称性。孤子家庭在二维版本的单和双δ功能系统也进行了研究。对于光学中的空间孤子和玻色-爱因斯坦凝聚体中的空间孤子,可以实现一维和二维设置。

英文摘要:

We introduce a system with competing self-focusing (SF) and self-defocusing (SDF) terms, which have the same scaling dimension. In the one-dimensional (1D) system, this setting is provided by a combination of the SF cubic term multiplied by the delta-function, $δ(x)$, and a spatially uniform SDF quintic term. This system gives rise to the most general family of 1D-Townes solitons, the entire family being unstable. However, it is completely stabilized by a finite-width regularization of the $δ$-function. The results are produced by means of numerical and analytical methods. We also consider the system with a symmetric pair of regularized $δ$-functions, which gives rise to a wealth of symmetric, antisymmetric, and asymmetric solitons, linked by a bifurcation loop, that accounts for the breaking and restoration of the symmetry. Soliton families in 2D versions of both the single- and double-delta-functional systems are also studied. The 1D and 2D settings may be realized for spatial solitons in optics, and in Bose-Einstein condensates.

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