Ya.V. Kartashov^†^a, S.K. Ivanov^a, Y.Q. Zhang^b, S.A. Zhuravitskii^c, N.N. Skryabin^c, I.V. Dyakonov^c, A.A. Kalinkin^c, S.P. Kulik^c, V.O. Kompanets^a, S.V. Chekalin^a, V.N. Zadkov^a, d
^aInstitute of Spectroscopy, Russian Academy of Sciences, ul. Fizicheskaya 5, Troitsk, Moscow, 108840, Russian Federation
^bKey Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, School of Electronic and Information Engineering, Xi’an Jiaotong University , Xi'an, China
^cQuantum Technology Center of Lomonosov Moscow State University, Leninskie Gory 1, build. 35, Moscow, 119991, Russian Federation
^dHSE University, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation

Progress in the observation of solitons in photonic topological insulators is discussed. Results are presented of experiments with nonlinear topological states in Su—Schrieffer—Heeger arrays — fabricated using the femtosecond writing technique — that are static, i.e., invariable in the direction of light propagation, and dynamically modulated (primarily periodically) in the direction of light propagation. Such objects are one of the simplest models of a topologically nontrivial structure. Solitons in topological insulators bifurcate with increasing laser beam power from linear edge states in the topological bandgap, inheriting their topological protection. The spatial localization of the soliton and the position of its propagation constant in the topological bandgap depend in a nonlinear medium on peak power and can be effectively controlled. Experimental observation of the switching of the edge topological modes in the bandgap between two closely spaced dimerized Su—Schrieffer—Heeger arrays is presented. The switching, whose rate depends on radiation intensity, can be completely arrested in a strongly nonlinear regime. In trimer waveguide arrays, whose spectrum in the topological phase features two simultaneously emerging topological bandgaps with edge states of different symmetries, two coexisting types of topological solitons exhibiting different degrees of stability were observed. We also discuss experimental observations of π-solitons — nonlinear topological Floquet states periodically reproducing their profiles in 1D- and 2D-dimensional Su—Schrieffer—Heeger arrays modulated in the direction of propagation of radiation.

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Keywords: Su—Schrieffer—Heeger arrays, topological solitons, switching, topological photonics
PACS: 05.45.Yv, 42.65.Re, 42.65.Tg (all)
DOI: 10.3367/UFNe.2024.08.039740
URL: https://ufn.ru/en/articles/2024/11/e/
Citation: Kartashov Ya V, Ivanov S K, Zhang Y Q, Zhuravitskii S A, Skryabin N N, Dyakonov I V, Kalinkin A A, Kulik S P, Kompanets V O, Chekalin S V, Zadkov V N "Experiments with nonlinear topological edge states in static and dynamically modulated Su—Schrieffer—Heeger arrays" Phys. Usp. 67 (11) (2024)

Received: 7th, March 2024, revised: 28th, June 2024, accepted: 28th, August 2024

Оригинал: Карташов Я В, Иванов С К, Жанг Й Ч, Журавицкий С А, Скрябин Н Н, Дьяконов И В, Калинкин А А, Кулик С П, Компанец В О, Чекалин С В, Задков В Н «Эксперименты с нелинейными топологическими состояниями в статических и динамически модулированных массивах Су—Шриффера—Хигера» УФН 194 1159–1176 (2024); DOI: 10.3367/UFNr.2024.08.039740