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Bragg solitons in topological Floquet insulators
Optics Letters
|April 15, 2020
Summary
We demonstrate topological Bragg solitons in a Floquet insulator made of waveguide arrays. These solitons arise from coupled topological edge states, enabled by nonlinearities and modulated coupling.
Area of Science:
- Topological photonics
- Nonlinear optics
- Condensed matter physics
Background:
- Topological Floquet insulators offer unique edge states.
- Waveguide arrays provide a platform for photonic topological phenomena.
Purpose of the Study:
- To investigate the formation of topological Bragg solitons.
- To explore the role of coupled topological edge states in nonlinear systems.
Main Methods:
- Theoretical modeling of a coupled waveguide array system.
- Analysis of topological edge states in a Floquet insulator.
- Inclusion of Kerr nonlinearity and longitudinal modulation.
Main Results:
- Identified two distinct topological edge states at the interface.
- Demonstrated resonant coupling of edge states via modulation.
- Predicted and theoretically presented topological Bragg solitons.
Conclusions:
- Coupled topological edge states in nonlinear Floquet insulators can support novel soliton states.
- Topological Bragg solitons represent a new class of nonlinear topological phenomena.
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