Topological edge states of nonequilibrium polaritons in hollow honeycomb arrays

Abstract

We address topological currents in polariton condensates excited by uniform resonant pumps in finite honeycomb arrays of microcavity pillars with a hole in the center. Such currents arise under combined action of the spin-orbit coupling and the Zeeman splitting that break the time-reversal symmetry and open a topological gap in the spectrum of the structure. The most representative feature of this structure is the presence of two interfaces, inner and outer ones, where the directions of topological currents are opposite. Due to the finite size of the structure polariton-polariton interactions lead to the coupling of the edge states at the inner and outer interfaces, which depends on the size of the hollow region. Moreover, switching between currents can be realized by tuning the pump frequency. We illustrate that currents in this finite structure can be stable and study bistability effects arising due to the resonant character of the pump.

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• Topological Photonics
• Nonlinear topological photonics
• Observation of Topological Band Gap Solitons
• Topological Polaritons
• Polariton $\mathbb{Z}$ Topological Insulator
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• Topological Polaritons and Excitons in Garden Variety Systems
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Cited by in corpus (5)

• From the topological spin-Hall effect to the non-Hermitian skin effect in an elliptical micropillar chain
• Optically induced topological spin-valley Hall effect for exciton polaritons
• Observation of nonlinearity-controlled switching of topological edge states
• Topological edge and corner states in coupled wave lattices in nonlinear polariton condensates
• Topological edge states in curved zigzag superlattices in nonlinear exciton-polaritons