Coupling between Exciton-Polariton Corner Modes through Edge States

Recently realized higher order topological insulators have taken a surge of interest among the theoretical and experimental condensed matter community. The two-dimensional second order topological insulators give rise to zero-dimensional localized corner modes that reside within the band gap of the...

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Bibliographic Details
Published in:Physical review letters 2020-02, Vol.124 (6), p.063901-063901, Article 063901
Main Authors: Banerjee, R, Mandal, S, Liew, T C H
Format: Article
Language:English
Subjects:
Condensed matter physics
Corners
Coupling
Excitons
Polaritons
Topological insulators
Topology
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Summary:Recently realized higher order topological insulators have taken a surge of interest among the theoretical and experimental condensed matter community. The two-dimensional second order topological insulators give rise to zero-dimensional localized corner modes that reside within the band gap of the system along with edge modes that inhabit a band edge next to bulk modes. Thanks to the topological nature, information can be trapped at the corners of these systems, which will be unhampered even in the presence of disorder. Being localized at the corners, the exchange of information among the corner states is an issue. Here we show that the nonlinearity in an exciton polariton system can allow the coupling between the different corners through the edge states based on optical parametric scattering, realizing a system of multiple connectible topological modes.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.124.063901