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Single-electron induced surface plasmons on a topological nanoparticle

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Title: Single-electron induced surface plasmons on a topological nanoparticle
Authors: Siroki, G
Lee, DKK
Haynes, PD
Giannini, V
Item Type: Journal Article
Abstract: It is rarely the case that a single electron affects the behaviour of several hundred thousands of atoms. Here we demonstrate a phenomenon where this happens. The key role is played by topological insulators—materials that have surface states protected by time-reversal symmetry. Such states are delocalized over the surface and are immune to its imperfections in contrast to ordinary insulators. For topological insulators, the effects of these surface states will be more strongly pronounced in the case of nanoparticles. Here we show that under the influence of light a single electron in a topologically protected surface state creates a surface charge density similar to a plasmon in a metallic nanoparticle. Such an electron can act as a screening layer, which suppresses absorption inside the particle. In addition, it can couple phonons and light, giving rise to a previously unreported topological particle polariton mode. These effects may be useful in the areas of plasmonics, cavity electrodynamics and quantum information.
Issue Date: 5-Aug-2016
Date of Acceptance: 27-Jun-2016
URI: http://hdl.handle.net/10044/1/33378
DOI: http://dx.doi.org/10.1038/ncomms12375
ISSN: 2041-1723
Publisher: Nature Publishing Group
Journal / Book Title: Nature Communications
Volume: 7
Copyright Statement: 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 article’s 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/
Sponsor/Funder: Engineering and Physical Sciences Research Council
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/L015579/1
Keywords: Multidisciplinary
Publication Status: Published
Article Number: 12375
Appears in Collections:Faculty of Engineering
Condensed Matter Theory
Materials
Physics
Faculty of Natural Sciences



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