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Observation of nonlinear disclination states

Introduction of controllable deformations into periodic materials that lead to disclinations in their structure opens novel routes for construction of higher-order topological insulators hosting topological states at disclinations. Appearance of these topological states is consistent with the bulk-d...

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Autores principales: Ren, Boquan, Arkhipova, Antonina A., Zhang, Yiqi, Kartashov, Yaroslav V., Wang, Hongguang, Zhuravitskii, Sergei A., Skryabin, Nikolay N., Dyakonov, Ivan V., Kalinkin, Alexander A., Kulik, Sergei P., Kompanets, Victor O., Chekalin, Sergey V., Zadkov, Victor N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10412544/
https://www.ncbi.nlm.nih.gov/pubmed/37558694
http://dx.doi.org/10.1038/s41377-023-01235-x
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author Ren, Boquan
Arkhipova, Antonina A.
Zhang, Yiqi
Kartashov, Yaroslav V.
Wang, Hongguang
Zhuravitskii, Sergei A.
Skryabin, Nikolay N.
Dyakonov, Ivan V.
Kalinkin, Alexander A.
Kulik, Sergei P.
Kompanets, Victor O.
Chekalin, Sergey V.
Zadkov, Victor N.
author_facet Ren, Boquan
Arkhipova, Antonina A.
Zhang, Yiqi
Kartashov, Yaroslav V.
Wang, Hongguang
Zhuravitskii, Sergei A.
Skryabin, Nikolay N.
Dyakonov, Ivan V.
Kalinkin, Alexander A.
Kulik, Sergei P.
Kompanets, Victor O.
Chekalin, Sergey V.
Zadkov, Victor N.
author_sort Ren, Boquan
collection PubMed
description Introduction of controllable deformations into periodic materials that lead to disclinations in their structure opens novel 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 to the filling anomaly that results in fractional charges to the boundary unit cells. So far, topological disclination states were observed only in the linear regime, while the interplay between nonlinearity and topology in the systems with disclinations has been never studied experimentally. We report here on the experimental observation of the nonlinear photonic disclination states in waveguide arrays with pentagonal or heptagonal disclination cores inscribed in transparent optical medium using the fs-laser writing technique. The transition between nontopological and topological phases in such structures is controlled by the Kekulé distortion coefficient r with topological phase hosting simultaneously 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.
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spelling pubmed-104125442023-08-11 Observation of nonlinear disclination states Ren, Boquan Arkhipova, Antonina A. Zhang, Yiqi Kartashov, Yaroslav V. Wang, Hongguang Zhuravitskii, Sergei A. Skryabin, Nikolay N. Dyakonov, Ivan V. Kalinkin, Alexander A. Kulik, Sergei P. Kompanets, Victor O. Chekalin, Sergey V. Zadkov, Victor N. Light Sci Appl Article Introduction of controllable deformations into periodic materials that lead to disclinations in their structure opens novel 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 to the filling anomaly that results in fractional charges to the boundary unit cells. So far, topological disclination states were observed only in the linear regime, while the interplay between nonlinearity and topology in the systems with disclinations has been never studied experimentally. We report here on the experimental observation of the nonlinear photonic disclination states in waveguide arrays with pentagonal or heptagonal disclination cores inscribed in transparent optical medium using the fs-laser writing technique. The transition between nontopological and topological phases in such structures is controlled by the Kekulé distortion coefficient r with topological phase hosting simultaneously 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. Nature Publishing Group UK 2023-08-10 /pmc/articles/PMC10412544/ /pubmed/37558694 http://dx.doi.org/10.1038/s41377-023-01235-x Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Ren, Boquan
Arkhipova, Antonina A.
Zhang, Yiqi
Kartashov, Yaroslav V.
Wang, Hongguang
Zhuravitskii, Sergei A.
Skryabin, Nikolay N.
Dyakonov, Ivan V.
Kalinkin, Alexander A.
Kulik, Sergei P.
Kompanets, Victor O.
Chekalin, Sergey V.
Zadkov, Victor N.
Observation of nonlinear disclination states
title Observation of nonlinear disclination states
title_full Observation of nonlinear disclination states
title_fullStr Observation of nonlinear disclination states
title_full_unstemmed Observation of nonlinear disclination states
title_short Observation of nonlinear disclination states
title_sort observation of nonlinear disclination states
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10412544/
https://www.ncbi.nlm.nih.gov/pubmed/37558694
http://dx.doi.org/10.1038/s41377-023-01235-x
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