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- W3100713200 abstract "In this work we first discuss systematically three general approaches to construct a non-Hermitian flat band, defined by its dispersionless real part. They resort to, respectively, spontaneous restoration of non-Hermitian particle-hole symmetry, a persisting flat band from the underlying Hermitian system, and a compact Wannier function that is an eigenstate of the entire system. For the last approach in particular, we show the simplest lattice structure where it can be applied, and we further identify a special case of such a flat band where every point in the Brillouin zone is an exceptional point of order 3. A localized excitation in this EP3 flat band can display either a conserved power, quadratic power increase, or even quartic power increase, depending on whether the localized eigenstate or one of the two generalized eigenvectors is initially excited. Nevertheless, the asymptotic wave function in the long time limit is always given by the eigenstate, and in this case, the compact Wannier function or its superposition in two or more unit cells." @default.
- W3100713200 created "2020-11-23" @default.
- W3100713200 creator A5081083643 @default.
- W3100713200 date "2018-03-05" @default.
- W3100713200 modified "2023-10-18" @default.
- W3100713200 title "Non-Hermitian lattices with a flat band and polynomial power increase [Invited]" @default.
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- W3100713200 doi "https://doi.org/10.1364/prj.6.000a10" @default.
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