Observation of nonlinear disclination states

Kartashov, Y.; Ren, B.; Arkhipova, A.; Zhang, Y.; Wang, H.; Zhuravitskii, S.A.; Skryabin, N.N.; Dyakonov, I.; Kalinkin, A.A.; Kulik, S.P.; Kompanets, V.; Chekalin, S.; Zadkov, V.N.

Авторы: Kartashov Yaroslav, Ren Boquan, Arkhipova Antonina, Zhang Yiqi, Wang Hongguang, Zhuravitskii Sergey Alekseevich, Skryabin Nikolay N., Dyakonov Ivan, Kalinkin Alexander A., Kulik Sergei P., Kompanets Victor, Chekalin Sergey, Zadkov Victor N.
Журнал: LIGHT-SCIENCE & APPLICATIONS
Том: 12
Номер: 194
Год издания: 2023
DOI: 10.1038/s41377-023-01235-x
Аннотация: Introduction of controllable deformations into periodic materials that lead to disclinations in their structure opensnovel routes for construction of higher-order topological insulators hosting topological states at disclinations.Appearance of these topological states is consistent with the bulk-disclination correspondence principle, and is due tothe filling anomaly that results in fractional charges to the boundary unit cells. So far, topological disclination stateswere observed only in the linear regime, while the interplay between nonlinearity and topology in the systems withdisclinations has been never studied experimentally. We report here on the experimental observation of the nonlinearphotonic disclination states in waveguide arrays with pentagonal or heptagonal disclination cores inscribed intransparent optical medium using the fs-laser writing technique. The transition between nontopological andtopological phases in such structures is controlled by the Kekulé distortion coefficient r with topological phase hostingsimultaneously disclination states at the inner disclination core and spatially separated from them corner-I, corner-II,and extended edge states at the outer edge of the structure. We show that the robust nonlinear disclination states bifurcate from their linear counterparts and that location of their propagation constants in the gap and, hence, their spatial localization can be controlled by their power. Nonlinear disclination states can be efficiently excited by Gaussian input beams, but only if they are focused into the waveguides belonging to the disclination core, where such topological states reside. Our results open new prospects for investigation of nonlinear effects in topological systems with disclinations and are relevant for different areas of science, including Bose-Einstein and polariton condensates,where potentials with the disclinations can be created.
Добавил в систему: Кулик Сергей Павлович

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Observation of nonlinear disclination statesстатья

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