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  • Being exceptional in higher dimensions

    In a study published in Physical Review Letters, researchers experimentally observed a continuous three-dimensional surface of exceptional points by constructing a four-dimensional synthetic space using magnon polaritons.
    Top: A 3D “exceptional” surfaces calculated from measured reflection spectra with an exceptional saddle point as indicated by the black dot at the middle. Bottom: the anisotropic behavior at the exceptional saddle point, which originate from unique couplings between magnons and microwave photons.