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Updated: Dec 10, 2025

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Nonlinear higher-order polariton topological insulator
We demonstrate control over exciton-polariton corner states in a nonlinear topological insulator. These states are localized and tunable via pump energy, persisting even with perturbations.
Area of Science:
- Condensed Matter Physics
- Nonlinear Optics
- Topological Photonics
Background:
- Higher-order topological insulators exhibit unique boundary states protected by symmetry.
- Exciton-polaritons in microcavities offer a platform for exploring nonlinear quantum phenomena.
- Kagome lattices are known for their rich electronic and photonic band structures.
Purpose of the Study:
- To investigate the resonant response and bistability of exciton-polariton corner states.
- To explore the role of nonlinearity and dispersion in localizing these states.
- To understand the influence of pump energy and lattice symmetry on corner state formation.
Main Methods:
- Realization of a higher-order nonlinear topological insulator using a kagome arrangement of microcavity pillars.
- Resonant excitation of exciton-polariton states using a pump.
- Analysis of state localization and energy characteristics under varying pump conditions and perturbations.
Main Results:
- Exciton-polariton corner states are resonantly excited and stabilized by a balance of pump, losses, nonlinearity, and dispersion.
- The localization of these nonlinear corner states is controllable by tuning the pump energy.
- Corner states are energetically isolated from edge states and robust against perturbations in corner pillars.
Conclusions:
- The formation mechanism of corner states is linked to the symmetry of the truncated kagome array.
- Nonlinear exciton-polariton corner states in higher-order topological insulators are tunable and robust.
- This work provides insights into controlling localized states in engineered photonic systems.
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