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Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry

Chen, MLN; Jiang, LJ; Lan, Z; Sha, WEI; (2020) Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry. Physical Review Research , 2 (4) , Article 043148. 10.1103/physrevresearch.2.043148. Green open access

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Abstract

We demonstrate the coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C 3 v symmetry, which is composed of three interlacing triangular sublattices with the same lattice constants. By tuning the geometry of the sublattices, three complete photonic band gaps with nontrivial topology can be created, one of which is due to the band inversion associated with the pseudospin degree of freedom at the Γ point and the other two due to the gapping out of Dirac cones associated with the valley degree of freedom at the K , K ′ points. The system can support triband pseudospin- and valley-momentum locking edge states at properly designed domain-wall interfaces. Furthermore, to demonstrate the novel interplay of the two kinds of edge states in a single configuration, we design a four-channel system, where the unidirectional routing of electromagnetic waves against sharp bends between two routes can be selectively controlled by the pseudospin and valley degrees of freedom. Our work combines the pseudospin and valley degrees of freedom in a single configuration and may provide more flexibility in manipulating electromagnetic waves with promising potential for multiband and multifunctional applications.

Type: Article
Title: Coexistence of pseudospin- and valley-Hall-like edge states in a photonic crystal with C3v symmetry
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/physrevresearch.2.043148
Publisher version: https://doi.org/10.1103/PhysRevResearch.2.043148
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10114480
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