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arXiv 1702.07008nlin.PS
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对称和非对称双势垒中的暗孤子散射

Dark Soliton Scattering in Symmetric and Asymmetric Double Potential Barriers

F. Tsitoura, Z. A. Anastassi, J. L. Marzuola, P. G. Kevrekidis, D. J. Frantzeskakis

摘要:

最近的理论研究的启发(亮)孤子二极管在多个散射体的系统中的效果,以及由实验研究的孤子杂质相互作用,我们认为一些典型的情况下,一对散射体的暗孤子的相互作用的例子。以一种与亮孤子的情况基本相反的方式(但与它们的“反粒子特征”相一致),我们发现暗孤子在通过第一个势垒时会加速,因此不能被第二个等高势垒捕获。一对不相等的势垒可以导致来自第二个势垒的反射,但是在势垒间区域中不会发生捕获。我们也给出了一些例子,动态调整的障碍,以陷阱的暗孤子在势垒间区域,但我们表明,这只能发生在有限的时间范围内,与暗孤子总是逃脱最终,相反的是什么是潜在的情况下与明亮的孤子。

英文摘要:

Motivated by the recent theoretical study of (bright) soliton diode effects in systems with multiple scatterers, as well as by experimental investigations of soliton-impurity interactions, we consider some prototypical case examples of interactions of dark solitons with a pair of scatterers. In a way fundamentally opposite to the case of bright solitons (but consonant to their "anti-particle character"), we find that dark solitons accelerate as they pass the first barrier and hence cannot be trapped by a second equal-height barrier. A pair of unequal barriers may lead to reflection from the second one, however trapping in the inter-barrier region cannot occur. We also give some examples of dynamical adjusting the barriers to trap the dark soliton in the inter-barrier region, yet we show that this can only occur over finite time horizons, with the dark soliton always escaping eventually, contrary again to what is potentially the case with bright solitons.

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