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Title: | Bulk-edge correspondence and long-range hopping in the topological plasmonic chain |
Authors: | Pocockc, Simon R.; Huidobro, Paloma A.; Giannini, V. ![]() |
Keywords: | Topological photonics Bulk-edge correspondence Topological plasmonics |
Issue Date: | 29-Apr-2019 |
Publisher: | Walter de Gruyter |
Citation: | Nanophotonics 8(8): 1337–1347 (2019) |
Abstract: | The existence of topologically protected edge modes is often cited as a highly desirable trait of topological insulators. However, these edge states are not always present. A realistic physical treatment of long-range hopping in a one-dimensional dipolar system can break the symmetry that protects the edge modes without affecting the bulk topological number, leading to a breakdown in bulk-edge correspondence (BEC). Hence, it is important to gain a better understanding of where and how this occurs, as well as how to measure it. Here we examine the behaviour of the bulk and edge modes in a dimerised chain of metallic nanoparticles and in a simpler non-Hermitian next-nearest-neighbour model to provide some insights into the phenomena of bulk-edge breakdown. We construct BEC phase diagrams for the simpler case and use these ideas to devise a measure of symmetry-breaking for the plasmonic system based on its bulk properties. This provides a parameter regime in which BEC is preserved in the topological plasmonic chain, as well as a framework for assessing this phenomenon in other systems. |
Description: | 11 pags. 6 figs.-- Open Access funded by Creative Commons Atribution Licence 4.0 |
Publisher version (URL): | http://dx.doi.org/10.1515/nanoph-2019-0033 |
URI: | http://hdl.handle.net/10261/208182 |
DOI: | 10.1515/nanoph-2019-0033 |
Identifiers: | doi: 10.1515/nanoph-2019-0033 issn: 2192-8614 |
Appears in Collections: | (CFMAC-IEM) Artículos |
Files in This Item:
File | Description | Size | Format | |
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Bulk-edge correspondence.pdf | 1,19 MB | Adobe PDF | ![]() View/Open | |
j_nanoph-2019-0033_suppl.pdf | 863,86 kB | Adobe PDF | ![]() View/Open |
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