Construction of Topological Bound States in the Continuum Via Subsymmetry

Scientific paper - Original scientific paper

• Author: Xiangdong Wang
• Author: Domenico Bongiovanni
• Author: Ziteng Wang
• Author: Amgad Abdrabou
• Author: Zhichan Hu
• Author: Dario Jukić
• Author: Daohong Song
• Author: Roberto Morandotti
• Author: Ramy El-Ganainy
• Author: Zhigang Chen
• Author: Hrvoje Buljan
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

Topological bound states in the continuum (BICs) are localized topological boundary modes coexisting with a continuous spectrum of extended modes. They have been realized in systems with symmetry-protected topological phases, where their immunity to defects and perturbations depends on the presence of symmetries. Here we propose a method that transforms an in-gap topological boundary state into a BIC by using the concept of subsymmetry. We design the coupling between a system possessing in-gap... More topological modes and a system possessing a continuum of states that results in topological BICs. We define the criteria for the coupling that yields the desired results. To implement this scheme, we construct representative topological BICs based on one-dimensional Su−Schrieffer−Heeger models and implement them in photonic lattices. Our results not only reveal novel physical phenomena but may also provide methods for designing a new generation of topological devices. Less

• Keywords (english): bound states in the continuum; subsymmetry; topological photonics; topological phase of matter; photonic lattices
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: ACS Photonics
• Numbering: vol. 11, no. 8, pp. 3213-3220
• p-ISSN: 2330-4022
• e-ISSN: 2330-4022
• DOI: https://doi.org/10.1021/acsphotonics.4c00600
• URN:NBN: urn:nbn:hr:217:193395
• Publication: 2024-07-17
• Project: Number: KK.01.1.1.01.0004; Title (croatian): Provedba vrhunskih istraživanja u sklopu Znanstvenog centra izvrsnosti za kvantne i kompleksne sustave te reprezentacije Liejevih algebri; Title (english): Implementation of top research within the Scientific Center of Excellence for Quantum and Complex Systems, and Representations of Lie Algebras; Acronym: QuantiXLie; Leader: Hrvoje Buljan; Jurisdiction: eu; Funding stream: European Regional Development Fund
• Document URL: https://pubs.acs.org/doi/10.1021/acsphotonics.4c00600
• Type of resource: Text
• Access conditions: Open access
• Public note: © 2024 American Chemical Society. This article is licensed under CC-BY 4.0. Received: March 29, 2024. Revised: June 27, 2024. Accepted: June 27, 2024. Published: July 17, 2024.
• Created on: 2025-03-17 10:32:50