6533b82dfe1ef96bd12915f5
RESEARCH PRODUCT
Nonlinear higher-order polariton topological insulator
Yaroslav V. KartashovYiqi ZhangAlbert FerrandoYongdong LiLluis Tornersubject
Nonlinear opticsBistabilityFOS: Physical sciences02 engineering and technologyPattern Formation and Solitons (nlin.PS)01 natural sciences010309 opticsOptics0103 physical sciencesDispersion (optics)PolaritonPhysicsÒptica no linealCondensed matter physics:Física [Àrees temàtiques de la UPC]business.industry021001 nanoscience & nanotechnologyNonlinear Sciences - Pattern Formation and SolitonsAtomic and Molecular Physics and OpticsSymmetry (physics)Magnetic fieldNonlinear systemTopological insulatorExcited stateinsulators0210 nano-technologybusinessOptics (physics.optics)Physics - Opticsdescription
We address the resonant response and bistability of the exciton-polariton corner states in a higher-order nonlinear topological insulator realized with kagome arrangement of microcavity pillars. Such states are resonantly excited and exist due to the balance between pump and losses, on the one hand, and between nonlinearity and dispersion in inhomogeneous potential landscape, on the other hand, for pump energy around eigen-energies of corresponding linear localized modes. Localization of the nonlinear corner states in a higher-order topological insulator can be efficiently controlled by tuning pump energy. We link the mechanism of corner state formation with symmetry of the truncated kagome array. Corner states coexist with densely packed edge states, but are well-isolated from them in energy. Nonlinear corner states persist even in the presence of perturbations in corner microcavity pillar.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-08-19 |