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arXiv 1107.0637nlin.PScond-mat.othercond-mat.quant-gasphysics.optics
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运动线性缺陷对二维离散孤子的拖曳

Dragging two-dimensional discrete solitons by moving linear defects

V. A. Brazhnyi, B. A. Malomed

摘要:

研究了附着在运动缺陷上的小振幅孤子在二维离散非线性薛定谔(DNLS)晶格中的迁移率。结果进行了比较的情况下,当一个自由的小振幅的二维离散孤子踢在均匀晶格。与先前已知的结果一致,经过一段时间的瞬态运动的自由孤子转化为本地化模式钉扎的Peierls-Nabarro潜力,无论初始速度。然而,附着在运动缺陷上的孤立子可以被拖曳无限长的距离(包括具有突然转弯和圆形轨迹的路线),几乎没有损失,只要拖曳速度小于某个临界值。研究了两个缺陷对孤子碰撞的影响。如果速度足够小,碰撞导致自发对称性破缺,特征是两个孤子融合成一个单独的孤子,它仍然附着在两个缺陷中的任何一个上。

英文摘要:

We study the mobility of small-amplitude solitons attached to moving defects which drag the solitons across a two-dimensional (2D) discrete nonlinear-Schrödinger (DNLS) lattice. Findings are compared to the situation when a free small-amplitude 2D discrete soliton is kicked in the uniform lattice. In agreement with previously known results, after a period of transient motion the free soliton transforms into a localized mode pinned by the Peierls-Nabarro potential, irrespective of the initial velocity. However, the soliton attached to the moving defect can be dragged over an indefinitely long distance (including routes with abrupt turns and circular trajectories) virtually without losses, provided that the dragging velocity is smaller than a certain critical value. Collisions between solitons dragged by two defects in opposite directions are studied too. If the velocity is small enough, the collision leads to a spontaneous symmetry breaking, featuring fusion of two solitons into a single one, which remains attached to either of the two defects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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