Dynamically Emerging Topological Phase Transitions in Nonlinear Interacting Soliton Lattices

Bongiovanni, Domenico; Jukić, Dario; Hu, Zhichan; Lunić, Frane; Hu, Yi; Song, Daohong; Morandotti, Roberto; Chen, Zhigang; Buljan, Hrvoje

doi:10.1103/physrevlett.127.184101

Cited by 13 publications

(5 citation statements)

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“…In this work we report the experimental observation of nonlinearity-controlled switching between the edge states arising in two dimerized Su-Schrieffer-Heeger [73] topological waveguide arrays brought into close proximity. Each array, when properly truncated, can support solitons bifurcating from edge states in the topological bandgap, as realized theoretically [74][75][76][77][78][79] and experimentally [80][81][82][83]. Here we observe experimentally that when two of such arrays approach each other, the overlap of the modal fields for the topological states causes their periodic switching between the arrays, with a switching rate that depends on the intensity of the input beam and on the separation between the arrays.…”

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confidence: 56%

Observation of nonlinearity-controlled switching of topological edge states

et al. 2022

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We report the experimental observation of the periodic switching of topological edge states between two dimerized fs-laser written waveguide arrays. Switching occurs due to the overlap of the modal fields of the edge states from topological forbidden gap, when they are simultaneously present in two arrays brought into close proximity. We found that the phenomenon occurs for both strongly and weakly localized edge states and that switching rate increases with decreasing spacing between the topological arrays. When topological arrays are brought in contact with nontopological ones, switching in topological gap does not occur, while one observes either the formation of nearly stationary topological interface mode or strongly asymmetric diffraction into the nontopological array depending on the position of the initial excitation. Switching between topological arrays can be controlled and even completely arrested by increasing the peak power of the input signal, as we observed with different array spacings.

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confidence: 56%

Observation of nonlinearity-controlled switching of topological edge states

et al. 2022

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“…Among the simplest models admitting the formation of the 1D edge solitons bifurcating from linear edge states are dimerized Su-Schrieffer-Heeger lattices [47]. Nonlinear topological states in such lattices have been studied theoretically in [48][49][50][51][52][53][54] and observed experimentally in electric circuits [24], topological fiber loops [55], polariton condensates [13,56] and, in the weakly nonlinear regime, in photonic lattices [57,58]. However, most experiments with weakly nonlinear edge states and edge solitons were performed in structures with a single topological bandgap, admitting the formation of edge solitons of only one type.…”

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confidence: 99%

Observation of Edge Solitons in Topological Trimer Arrays

et al. 2022

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We report the experimental observation of nonlinear light localization and edge soliton formation at the edges of fs-laser written trimer waveguide arrays, where transition from non-topological to topological phases is controlled by the spacing between neighboring trimers. We found that, in the former regime, edge solitons occur only above a considerable power threshold, whereas in the latter one they bifurcate from linear states. Edge solitons are observed in a broad power range where their propagation constant falls into one of the topological gaps of the system, while partial delocalization is observed when considerable nonlinearity drives the propagation constant into an allowed band, causing coupling with bulk modes. Our results provide direct experimental evidence of the coexistence and selective excitation in the same or in different topological gaps of two types of topological edge solitons with different internal structures, which can rarely be observed even in nontopological systems. This also constitutes the first experimental evidence of formation of topological solitons in a nonlinear system with more than one topological gap.

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“…[395][396][397][398] Therefore, non-linearity appears as a convenient tool enabling the tuning of the properties of excitations in topological systems. [399][400][401][402][403][404][405][406][407] A non-linear resonant unit based on the active control of the external circuit can realize directional long-range WPT with active control and robustness. The experimental device for actively controlling directional WPT measurements is shown in Figure 17.…”

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confidence: 99%

1D Photonic Topological Insulators Composed of Split Ring Resonators: A Mini Review

Guo,

Wang,

et al. 2023

Advanced Physics Research

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In recent years, topological photonics inspired by electric topological insulators has promoted extensive research on robust electromagnetic (EM) wave manipulation and new wave‐functional devices. Optical resonators can significantly confine EM waves and are the basic building blocks for constructing diverse topological structures under a tight binding mechanism. As an artificial “magnetic atom,” the split‐ring‐resonator (SRR) is one of the most attractive optical resonators. SRRs provide an excellent and flexible platform for constructing various topological structures with complex coupling distributions, uncovering abundant topological properties, and innovating practical devices. Here, the realization and fundamental EM responses of the SRR are briefly introduced. Compared to conventional EM resonance elements, the coupling between SRRs depends not only on the coupling distance but also on the orientation angle of the slits. The recent achievements in various low‐dimensional photonic topological structures composed of SRRs are summarized. Furthermore, this review explains the underlying physical principles and discusses progress in topological devices with SRRs, including wireless power transfer, sensing, and switching. Finally, this review provides an overview of the future of SRR topological structures and their impact on the development of novel topological systems and devices.

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Dynamically Emerging Topological Phase Transitions in Nonlinear Interacting Soliton Lattices

Cited by 13 publications

References 50 publications

Observation of nonlinearity-controlled switching of topological edge states

Observation of nonlinearity-controlled switching of topological edge states

Observation of Edge Solitons in Topological Trimer Arrays

1D Photonic Topological Insulators Composed of Split Ring Resonators: A Mini Review

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