Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/102640
Title: Spin momentum-locked surface states in metamaterials without topological transition
Authors: Peng, Liang
Chen, Yuntian
Yang, Yihao
Wang, Zhiyu
Yu, Faxin
Wang, Gaofeng
Shen, Nian-Hai
Zhang, Baile
Soukoulis, Costas M.
Chen, Hongsheng
Keywords: Science::Physics::Electricity and magnetism
Bianisotropy
Electromagnetic Metamaterials
Issue Date: 2018
Source: Peng, L., Chen, Y., Yang, Y., Wang, Z., Yu, F., Wang, G., . . . Chen, H. (2018). Spin momentum-locked surface states in metamaterials without topological transition. Laser & Photonics Reviews, 12(8), 1800002-. doi:10.1002/lpor.201800002
Series/Report no.: Laser & Photonics Reviews
Abstract: The photonic analogy of the quantum spin Hall Effect, that is, a photonic topological insulator (PTI), is of great relevance to science and technology in optics based on the promise of scattering‐free surface states. The challenges in realizing such scattering‐free surface states in PTIs and other types of symmetry‐protected topological phases are the result of the exact symmetry needed for creating a pair of time reversal pseudo‐spin states or special boundary conditions, wherein the exact symmetry imposes strict requirements on materials or boundary conditions. Here, it is experimentally demonstrated that scattering‐free edge states can be created with neither the aforementioned exact symmetry requirements for materials nor the topological transitions. This system is constructed by simply placing together regular homogeneous metamaterials, which are characterized by highly different bianisotropies. Of the particular surface states, backward reflection would be deeply suppressed, provided that the related evanescent tail into the bulk regions vanishes shortly and that the pseudo‐spin is not flipped by the scatterers. This work gives an example of constructing scattering‐free surface states in classical systems without strict symmetry protections and may potentially stimulate various novel applications in the future.
URI: https://hdl.handle.net/10356/102640
http://hdl.handle.net/10220/50284
ISSN: 1863-8880
DOI: 10.1002/lpor.201800002
Rights: This is the peer reviewed version of the following article: Peng, L., Chen, Y., Yang, Y., Wang, Z., Yu, F., Wang, G., . . . Chen, H. (2018). Spin momentum-locked surface states in metamaterials without topological transition. Laser & Photonics Reviews, 12(8), 1800002-, which has been published in final form at https://doi.org/10.1002/lpor.201800002. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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