Journal
SCIENCE
Volume 372, Issue 6537, Pages 72-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abf6873
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Funding
- National Key R&D Program of China [2017YFA0303800]
- National Natural Science Foundation [11922408, 91750204, 11674180]
- PCSIRT
- 111 Project [B07013]
- Sino-German Mobility Programme [M-0198]
- Deutsche Forschungsgemeinschaft [SZ 276/9-2, SZ 276/19-1, SZ 276/20-1, BL 574/13-1]
- Croatian Science Foundation [IP-2016-06-5885 SynthMagIA]
- QuantiXLie Center of Excellence (Croatian Government)
- QuantiXLie Center of Excellence (European Union through the European Regional Development Fund Competitiveness and Cohesion Operational Programme) [KK.01.1.1.01.0004]
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The study established a nonlinear non-Hermitian topological platform for active tuning of PT symmetry and topological states, revealing the interaction between sensitivity close to exceptional points and the robustness of non-Hermitian topological states. The research provides opportunities for unconventional light manipulation and device applications through single-channel control of global PT symmetry and topology via local nonlinearity.
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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