Nonlinear tuning of PT symmetry and non-Hermitian topological states (CROSBI ID 308174)
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Xia, Shiqi ; Kaltsas, Dimitrios ; Song, Daohong ; Komis, Ioannis ; Xu, Jingjun ; Szameit, Alexander ; Buljan, Hrvoje ; Makris, Konstantinos G. ; Chen, Zhigang
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Nonlinear tuning of PT symmetry and non-Hermitian topological states
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.
nonlinear tuning ; PT symmetry ; non-Hermitian topological states
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