Three-dimensional photonic topological insulator without spin-orbit coupling

Spin-orbit coupling, a fundamental mechanism underlying topological insulators, has been introduced to construct the latter's photonic analogs, or photonic topological insulators (PTIs). However, the intrinsic lack of electronic spin in photonic systems leads to various imperfections in emulati...

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Main Authors: Kim, Minkyung, Wang, Zihao, Yang, Yihao, Teo, Hau Tian, Rho, Junsuk, Zhang, Baile
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/164871
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spelling sg-ntu-dr.10356-1648712023-02-28T20:12:05Z Three-dimensional photonic topological insulator without spin-orbit coupling Kim, Minkyung Wang, Zihao Yang, Yihao Teo, Hau Tian Rho, Junsuk Zhang, Baile School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) Science::Physics Spontaneous Emission Crystalline Insulator Spin-orbit coupling, a fundamental mechanism underlying topological insulators, has been introduced to construct the latter's photonic analogs, or photonic topological insulators (PTIs). However, the intrinsic lack of electronic spin in photonic systems leads to various imperfections in emulating the behaviors of topological insulators. For example, in the recently demonstrated three-dimensional (3D) PTI, the topological surface states emerge, not on the surface of a single crystal as in a 3D topological insulator, but along an internal domain wall between two PTIs. Here, by fully abolishing spin-orbit coupling, we design and demonstrate a 3D PTI whose topological surface states are self-guided on its surface, without extra confinement by another PTI or any other cladding. The topological phase follows the original Fu's model for the topological crystalline insulator without spin-orbit coupling. Unlike conventional linear Dirac cones, a unique quadratic dispersion of topological surface states is directly observed with microwave measurement. Our work opens routes to the topological manipulation of photons at the outer surface of photonic bandgap materials. Ministry of Education (MOE) National Research Foundation (NRF) Published version This work was financially supported by the POSCO-POSTECH-RIST Convergence Research Center program funded by POSCO, and the National Research Foundation (NRF) grant (NRF-2019R1A2C3003129) funded by the Ministry of Science and ICT (MSIT) of the Korean government. M.K. acknowledges the NRF Sejong Science fellowship (NRF-2022R1C1C2004662) funded by the MSIT of the Korean government. B.Z. acknowledges support by Singapore Ministry of Education Academic Research Fund Tier 3 Grant No. MOE-2016-T3-1-006, Tier 2 Grant No. MOE-2018-T2-1-022(S), and by Singapore National Research Foundation Competitive Research Program Grant no. NRF-CRP23-2019-0007. The work at Zhejiang University was sponsored by the National Natural Science Foundation of China (NSFC) under Grants No. 62175215. 2023-02-21T07:26:46Z 2023-02-21T07:26:46Z 2022 Journal Article Kim, M., Wang, Z., Yang, Y., Teo, H. T., Rho, J. & Zhang, B. (2022). Three-dimensional photonic topological insulator without spin-orbit coupling. Nature Communications, 13(1), 3499-. https://dx.doi.org/10.1038/s41467-022-30909-0 2041-1723 https://hdl.handle.net/10356/164871 10.1038/s41467-022-30909-0 35715401 2-s2.0-85132355549 1 13 3499 en MOE-2016-T3-1-006 MOE2018‐T2‐1‐022 (S) NRF-CRP23-2019-0007 Nature Communications 10.21979/N9/C05UAS © The Author(s) 2022. 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/. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Spontaneous Emission
Crystalline Insulator
spellingShingle Science::Physics
Spontaneous Emission
Crystalline Insulator
Kim, Minkyung
Wang, Zihao
Yang, Yihao
Teo, Hau Tian
Rho, Junsuk
Zhang, Baile
Three-dimensional photonic topological insulator without spin-orbit coupling
description Spin-orbit coupling, a fundamental mechanism underlying topological insulators, has been introduced to construct the latter's photonic analogs, or photonic topological insulators (PTIs). However, the intrinsic lack of electronic spin in photonic systems leads to various imperfections in emulating the behaviors of topological insulators. For example, in the recently demonstrated three-dimensional (3D) PTI, the topological surface states emerge, not on the surface of a single crystal as in a 3D topological insulator, but along an internal domain wall between two PTIs. Here, by fully abolishing spin-orbit coupling, we design and demonstrate a 3D PTI whose topological surface states are self-guided on its surface, without extra confinement by another PTI or any other cladding. The topological phase follows the original Fu's model for the topological crystalline insulator without spin-orbit coupling. Unlike conventional linear Dirac cones, a unique quadratic dispersion of topological surface states is directly observed with microwave measurement. Our work opens routes to the topological manipulation of photons at the outer surface of photonic bandgap materials.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Kim, Minkyung
Wang, Zihao
Yang, Yihao
Teo, Hau Tian
Rho, Junsuk
Zhang, Baile
format Article
author Kim, Minkyung
Wang, Zihao
Yang, Yihao
Teo, Hau Tian
Rho, Junsuk
Zhang, Baile
author_sort Kim, Minkyung
title Three-dimensional photonic topological insulator without spin-orbit coupling
title_short Three-dimensional photonic topological insulator without spin-orbit coupling
title_full Three-dimensional photonic topological insulator without spin-orbit coupling
title_fullStr Three-dimensional photonic topological insulator without spin-orbit coupling
title_full_unstemmed Three-dimensional photonic topological insulator without spin-orbit coupling
title_sort three-dimensional photonic topological insulator without spin-orbit coupling
publishDate 2023
url https://hdl.handle.net/10356/164871
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