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Nonlinear topological photonics is an emerging field aiming at extending thefascinating properties of topological states to the realm where interactionsbetween the system constituents cannot be neglected. Interactions can indeedtrigger topological phase transitions, induce symmetry protection androbustness properties for the many-body system. Moreover when coupling to theenvironment via drive and dissipation is also considered, novel collectivephenomena are expected to emerge. Here, we report the nonlinear response of apolariton lattice implementing a non-Hermitian version of theSu-Schrieffer-Heeger model. We trigger the formation of solitons in thetopological gap of the band structure, and show that these solitons demonstraterobust nonlinear properties with respect to defects, because of the underlyingsub-lattice symmetry. Leveraging on the system non-Hermiticity, we engineer thedrive phase pattern and unveil bulk solitons that have no counterpart inconservative systems. They are localized on a single sub-lattice with a spatialprofile alike a topological edge state. Our results demonstrate a tool tostabilize the nonlinear response of driven dissipative topological systems,which may constitute a powerful resource for nonlinear topological photonics.

Topological gap solitons in a 1D non-Hermitian lattice