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@unpublished{Ungureanu:2020,
author = {Ungureanu, B and Makwana, M and Craster, R and Guenneau, S},
publisher = {arXiv},
title = {Localising symmetry protected edge waves via the topological rainbow effect},
url = {https://arxiv.org/abs/2003.13885},
year = {2020}
}

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TY - UNPB
AB - We combine two different fields, topological physics and metamaterials to design a topological metasurface tocontrol and redirect elastic waves. We strategically design a two-dimensional crystalline perforated elastic platethat hosts symmetry-induced topological edge states. By concurrently allowing the elastic substrate to spatiallyvary in depth, we are able to convert the incident slow wave into a series of robust modes, with differing envelopemodulations. This adiabatic transition localises the incoming energy into a concentrated region where it can thenbe damped or extracted. For larger transitions, different behaviour is observed; the incoming energy propagatesalong the interface before being partitioned into two disparate chiral beams. This “topological rainbow” effectleverages two main concepts, namely the quantum valley-Hall effect and the rainbow effect usually associatedwith electromagnetic metamaterials. The topological rainbow effect transcends specific physical systems, hence,the phenomena we describe can be transposed to other wave physics. Due to the directional tunability of theelastic energy by geometry our results have far-reaching implications for applications such as switches, filtersand energy-harvesters.
AU - Ungureanu,B
AU - Makwana,M
AU - Craster,R
AU - Guenneau,S
PB - arXiv
PY - 2020///
TI - Localising symmetry protected edge waves via the topological rainbow effect
UR - https://arxiv.org/abs/2003.13885
UR - http://hdl.handle.net/10044/1/79412
ER -

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