A nonlinear optical approach has now enabled picosecond control of a complex band structure, driving a non-Hermitian topological phase transition across an exceptional-point singularity.
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Gong, J., Lee, C.H. Topological phase transitions have never been faster. Nat. Phys. 20, 12–13 (2024). https://doi.org/10.1038/s41567-023-02211-3
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DOI: https://doi.org/10.1038/s41567-023-02211-3
