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arXiv · 2212.06235

Wave-packet spreading in the disordered and nonlinear Su-Schrieffer-Heeger chain

Bertin Many Manda·Vassos Achilleos·Olivier Richoux·Charalampos Skokos·Georgios Theocharis
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Abstract

We numerically investigate the characteristics of the long-time dynamics of a single-site wave-packet excitation in a disordered and nonlinear Su-Schrieffer-Heeger model. In the linear regime, as the parameters controlling the topology of the system are varied, we show that the transition between two different topological phases is preceded by an anomalous diffusion, in contrast to Anderson localization within these topological phases. In the presence of on-site nonlinearity this feature is lost due to mode-mode interactions. Direct numerical simulations reveal that the characteristics of the asymptotic nonlinear wave-packet spreading are the same across the whole studied parameter space. Our findings underline the importance of mode-mode interactions in nonlinear topological systems, which must be studied in order to define reliable nonlinear topological markers.

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Bertin Many Manda, Vassos Achilleos, Olivier Richoux, Charalampos Skokos, Georgios Theocharis. 2023-04-05. Wave-packet spreading in the disordered and nonlinear Su-Schrieffer-Heeger chain. https://doi.org/10.1103/physrevb.107.184313

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