Tunable three-way topological energy-splitter
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Published version
Author(s)
Makwana, Mehul
Chaplain, Gregory
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.
Date Issued
2019-12-12
Date Acceptance
2019-11-28
Citation
Scientific Reports, 2019, 9
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/.
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
Engineering & Physical Science Research Council (EPSRC)
Grant Number
EP/L024926/1
Subjects
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
HIGH-FREQUENCY HOMOGENIZATION
WAVE-GUIDE
HIGH TRANSMISSION
BEAM SPLITTER
EDGE STATES
CRYSTALS
BENDS
Publication Status
Published
Article Number
ARTN 18939