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  • Title: Self-localized states in photonic topological insulators.
    Author: Lumer Y, Plotnik Y, Rechtsman MC, Segev M.
    Journal: Phys Rev Lett; 2013 Dec 13; 111(24):243905. PubMed ID: 24483665.
    Abstract:
    We propose solitons in a photonic topological insulator: self-localized wave packets forming topological edge states residing in the bulk of a nonlinear photonic topological insulator. These self-forming entities exhibit, despite being in the bulk, the property of unidirectional transport, similar to the transport their linear counterparts display on the edge of a topological insulator. In the concrete case of a Floquet topological insulator, such a soliton forms when a wave packet induces, through nonlinearity, a defect region in a honeycomb lattice of helical optical waveguides, and at the same time the wave packet populates a continuously rotating outer (or inner) edge state of that region. The concept is universal and applicable to topological systems with nonlinear response or mean-field interactions.
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