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  • Title: Nonlinear tuning of PT symmetry and non-Hermitian topological states.
    Author: Xia S, Kaltsas D, Song D, Komis I, Xu J, Szameit A, Buljan H, Makris KG, Chen Z.
    Journal: Science; 2021 Apr 02; 372(6537):72-76. PubMed ID: 33795453.
    Abstract:
    Topology, parity-time (PT) symmetry, and nonlinearity are at the origin of many fundamental phenomena in complex systems across the natural sciences, but their mutual interplay remains unexplored. We established a nonlinear non-Hermitian topological platform for active tuning of PT symmetry and topological states. We found that the loss in a topological defect potential in a non-Hermitian photonic lattice can be tuned solely by nonlinearity, enabling the transition between PT-symmetric and non-PT-symmetric regimes and the maneuvering of topological zero modes. The interaction between two apparently antagonistic effects is revealed: the sensitivity close to exceptional points and the robustness of non-Hermitian topological states. Our scheme using single-channel control of global PT symmetry and topology via local nonlinearity may provide opportunities for unconventional light manipulation and device applications.
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