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Tunable three-way topological energy-splitter

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Title: Tunable three-way topological energy-splitter
Authors: Makwana, M
Chaplain, G
Item Type: Journal Article
Abstract: Strategically combining four structured domains creates the first ever three-way topological energy-splitter; remarkably, this isonly possible using a square, or rectangular, lattice, and not the graphene-like structures more commonly used in valleytronics.To achieve this effect, the two mirror symmetries, present within all fully-symmetric square structures, are broken; this leads totwo nondistinct interfaces upon which valley-Hall states reside. These interfaces are related to each other via the time-reversaloperator and it is this subtlety that allows us to ignite the third outgoing lead. The geometrical construction of our structuredmedium allows for the three-way splitter to be adiabatically converted into a wave steerer around sharp bends. Due tothe tunability of the energies directionality by geometry, our results have far-reaching implications for applications such asbeam-splitters, switches and filters across wave physics.
Issue Date: 12-Dec-2019
Date of Acceptance: 28-Nov-2019
URI: http://hdl.handle.net/10044/1/75420
DOI: 10.1038/s41598-019-55485-0
ISSN: 2045-2322
Publisher: Nature Publishing Group
Journal / Book Title: Scientific Reports
Volume: 9
Copyright Statement: 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. Te 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/.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/L024926/1
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
Publication Status: Published
Article Number: ARTN 18939
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences