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- W3102075018 abstract "The notion of synthetic dimensions has expanded the realm of topological physics to four dimensional (4D) space lately. In this work, non-Hermiticity is used as a synthetic parameter in PT-symmetric photonic crystals to study the topological physics in 4D non-Hermitian synthetic parameter space. We realize a 3D exceptional hypersurface (EHS) in such 4D parameter space, and the degeneracy points emerge due to the symmetry of synthetic parameters. We further demonstrate the existence of exceptional degenerate points (EDPs) on the EHS that originates from the chirality of exceptional points (EPs), and the exceptional surface near EDPs behaves like a Dirac cone. We further show that a very narrow reflection plateau can be found near these EDPs, and their sensitivity towards the PT-symmetry breaking environmental perturbation can make these degeneracy points useful in optical sensing and many other nonlinear and quantum optical applications." @default.
- W3102075018 created "2020-11-23" @default.
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- W3102075018 date "2020-01-13" @default.
- W3102075018 modified "2023-10-17" @default.
- W3102075018 title "Exceptional cones in 4D parameter space" @default.
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- W3102075018 doi "https://doi.org/10.1364/oe.381700" @default.
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