Oscillating edge states in polariton topological insulators

Abstract

We show that slow time-periodic variation of the external magnetic field applied to polariton topological insulator based on honeycomb array of microcavity pillars with pronounced TE-TM splitting results in oscillations of the edge states along the boundary of the insulator that are accompanied by slow transverse drift of the center of mass of the edge state along the boundary. The oscillations and drift are due to time-periodic variation of the sign of the instantaneous group velocity of the edge state with selected central Bloch momentum triggered by the variation of the Zeeman splitting in the external magnetic field. These oscillations are also accompanied by periodic exchange of norm between two polarization components of the edge state. Oscillating edge states survive despite the fact that magnetic field periodically vanishes resulting in closure of the topological gap in the instantaneous spectrum of the system. The direction of the drift and amplitude of oscillations of the edge state strongly and nonmonotonically depend on its initial central Bloch momentum.

arXiv comment6 pages,6 figures; to be appear on Physical Review B

References in corpus (20)

• Topological Photonics
• Topological Photonics
• Photonic Floquet Topological Insulators
• Robust optical delay lines via topological protection
• Exciton-polariton topological insulator
• Light propagation and localization in modulated photonic lattices and waveguides
• Topological Polaritons
• Polariton $\mathbb{Z}$ Topological Insulator
• The Peierls substitution in an engineered lattice potential
• Topological Polaritons and Excitons in Garden Variety Systems
• Bistable topological insulator with exciton-polaritons
• Realization of Anomalous Floquet Insulators in Strongly-Coupled Nanophotonic Lattices
• Unstable and stable regimes of polariton condensation
• Anti-chiral edge states in an exciton polariton strip
• Observation of $\pi$ solitons in oscillating waveguide arrays
• Rabi-like oscillation of photonic topological valley Hall edge states
• Bloch oscillations of topological edge modes
• One-way reflection-free exciton-polariton spin filtering channel
• Artificial Life in an Exciton-Polariton Lattice
• Spin-polarized antichiral exciton-polariton edge states