Observation of nonlinear disclination states

Boquan Ren; Antonina A. Arkhipova; Yiqi Zhang; Yaroslav V. Kartashov; Hongguang Wang; Sergei A. Zhuravitskii; Nikolay N. Skryabin; Ivan V. Dyakonov; Alexander A. Kalinkin; Sergei P. Kulik; Victor O. Kompanets; Sergey V. Chekalin; Victor N. Zadkov

doi:10.1038/s41377-023-01235-x

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Observation of nonlinear disclination states

Original Articles

- Observation of nonlinear disclination states
- Light: Science & Applications Vol. 12, Issue 9, Pages: 1818-1829(2023)
- Affiliations：
  
  1.Key Laboratory for Physical Electronics and Devices, Ministry of Education, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  2.Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow 108840, Russia
  3.Faculty of Physics, Higher School of Economics, Moscow 105066, Russia
  4.Quantum Technology Centre, Faculty of Physics, M. V. Lomonosov Moscow State University, Moscow 119991, Russia
- Author bio：
  
  Yiqi Zhang (zhangyiqi@xjtu.edu.cn)
  Yaroslav V. Kartashov (yaroslav.kartashov@icfo.eu)
- Funds：
- DOI：10.1038/s41377-023-01235-x
  CLC：
- Published：30 September 2023，
  
  Published Online：10 August 2023，
  
  Received：24 April 2023，
  
  Revised：10 July 2023，
  
  Accepted：14 July 2023
- Accepted：
Scan QR Code
Ren, B. Q. et al. Observation of nonlinear disclination states. Light: Science & Applications, 12, 1818-1829 (2023).
DOI：

Ren, B. Q. et al. Observation of nonlinear disclination states. Light: Science & Applications, 12, 1818-1829 (2023). DOI： 10.1038/s41377-023-01235-x.

摘要

Abstract

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

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.

关键词

Keywords

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