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Exceptional Topology Survives Strong Hermitian Fields in Radiative Atomic Arrays

Gou, Tian-Shu et al.
arXiv (OAI Expanded) · Papers
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mesoscale-and-nanoscale-physicsquantum-physics
Exceptional points are topological defects of complex band structures that are stable against weak perturbations, yet in bounded two-band systems they are ultimately removed by a sufficiently strong Hermitian field. Here we demonstrate a striking exception in a two-dimensional subwavelength atomic a
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