The topological plasmonic chain with retardation and radiative effects.

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Title: The topological plasmonic chain with retardation and radiative effects.
Authors: Pocock, SR
Xiao, X
Huidobro, PA
Giannini, V
Item Type: Journal Article
Abstract: We study a one-dimensional plasmonic system with nontrivial topology: a chain of metallic nanoparticles with alternating spacing, which in the limit of small particles is the plasmonic analogue to the Su-Schrieffer-Heeger model. Unlike prior studies we take into account long-range hopping with retardation and radiative damping, which is necessary for the scales commonly used in plasmonics experiments. This leads to a non-Hermitian Hamiltonian with frequency dependence that is notably not a perturbation of the quasistatic model. We show that the resulting band structures are significantly different, but that topological features such as quantized Zak phase and protected edge modes persist because the system has the same eigenmodes as a chirally symmetric system. We discover the existence of retardation-induced topological phase transitions, which are not predicted in the SSH model. We find parameters that lead to protected edge modes and confirm that they are highly robust under disorder, opening up the possibility of protected hotspots at topological interfaces that could have novel applications in nanophotonics.
Issue Date: 30-Apr-2018
Date of Acceptance: 30-Apr-2018
URI: http://hdl.handle.net/10044/1/59339
DOI: https://dx.doi.org/10.1021/acsphotonics.8b00117
ISSN: 2330-4022
Publisher: American Chemical Society
Journal / Book Title: ACS Photonics
Copyright Statement: © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acsphotonics.8b00117
Sponsor/Funder: European Commission
Funder's Grant Number: 700745
Publication Status: Published online
Online Publication Date: 2018-04-30
Appears in Collections:Condensed Matter Theory
Physics
Experimental Solid State
Faculty of Natural Sciences



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