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arXiv 2302.00477physics.opticsnlin.PS
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旋转拓扑边缘孤子

Rotating topological edge solitons

Sergey K. Ivanov, Yaroslav V. Kartashov

AI总结:

研究了旋转Su-Schrieffer-Heeger波导阵列中拓扑边缘孤子的形成,发现散焦非线性可将旋转移出的边缘态移回拓扑间隙,揭示了丰富的分岔结构及稳定性。

摘要:

我们研究了旋转Su-Schrieffer-Heeger波导阵列中拓扑边缘孤子的形成。非旋转拓扑阵列的线性谱特征在于存在拓扑间隙,其中包含两个边缘态。阵列的旋转显著改变了频谱,并可能将这些边缘态移出拓扑间隙。散焦非线性抵消了这一趋势,并将这些模式移回拓扑间隙,在此它们获得了拓扑边缘态典型的尾部结构。我们展示了旋转拓扑孤子丰富的分岔结构,并证明它们可以是稳定的。拓扑平凡阵列(其频谱中没有边缘态)的旋转也会导致局域边缘态的出现,但位于平凡的半无限间隙中。从平凡线性边缘态分岔出的旋转边缘孤子族同样存在,且足够强的散焦非线性也能将它们移入拓扑间隙,从而定性地改变其尾部结构。

英文摘要:

We address the formation of topological edge solitons in rotating Su-Schrieffer-Heeger waveguide arrays. The linear spectrum of the non-rotating topological array is characterized by the presence of topological gap with two edge states residing in it. Rotation of the array significantly modifies the spectrum and may move these edge states out of the topological gap. Defocusing nonlinearity counteracts this tendency and shifts such modes back into topological gap, where they acquire structure of tails typical for topological edge states. We present rich bifurcation structure for rotating topological solitons and show that they can be stable. Rotation of the topologically trivial array, without edge states in its spectrum, also leads to the appearance of localized edge states, but in a trivial semi-infinite gap. Families of rotating edge solitons bifurcating from the trivial linear edge states exist too and sufficiently strong defocusing nonlinearity can also drive them into the topological gap, qualitatively modifying the structure of their tails.

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