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Exploring nonlinear topological states of matter with exciton-polaritons: Edge solitons in kagome lattice

Exploring nonlinear topological states of matter with exciton-polaritons: Edge solitons in kagome lattice


Titill: Exploring nonlinear topological states of matter with exciton-polaritons: Edge solitons in kagome lattice
Höfundur: Gulevich, D. R.
Yudin, D.
Skryabin, D. V.
Iorsh, I. V.
Shelykh, Ivan   orcid.org/0000-0001-5393-821X
Útgáfa: 2017-05-11
Tungumál: Enska
Umfang: 1780
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Raunvísindastofnun (HÍ)
Science Institute (UI)
Birtist í: Scientific Reports;7(1)
ISSN: 2045-2322
DOI: 10.1038/s41598-017-01646-y
Efnisorð: Bose–Einstein condensates; Microresonators; Topological insulators
URI: https://hdl.handle.net/20.500.11815/332

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Tilvitnun:

Gulevich, D. R., Yudin, D., Skryabin, D. V., Iorsh, I. V., & Shelykh, I. A. (2017). Exploring nonlinear topological states of matter with exciton-polaritons: Edge solitons in kagome lattice. Scientific Reports, 7(1), 1780. doi:10.1038/s41598-017-01646-y

Útdráttur:

Matter in nontrivial topological phase possesses unique properties, such as support of unidirectional edge modes on its interface. It is the existence of such modes which is responsible for the wonderful properties of a topological insulator – material which is insulating in the bulk but conducting on its surface, along with many of its recently proposed photonic and polaritonic analogues. We show that exciton-polariton fluid in a nontrivial topological phase in kagome lattice, supports nonlinear excitations in the form of solitons built up from wavepackets of topological edge modes – topological edge solitons. Our theoretical and numerical results indicate the appearance of bright, dark and grey solitons dwelling in the vicinity of the boundary of a lattice strip. In a parabolic region of the dispersion the solitons can be described by envelope functions satisfying the nonlinear Schrödinger equation. Upon collision, multiple topological edge solitons emerge undistorted, which proves them to be true solitons as opposed to solitary waves for which such requirement is waived. Importantly, kagome lattice supports topological edge mode with zero group velocity unlike other types of truncated lattices. This gives a finer control over soliton velocity which can take both positive and negative values depending on the choice of forming it topological edge modes.

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