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- W2403977436 abstract "Loss-induced transmission in waveguides and reversed pump dependence in lasers are two prominent examples of counterintuitive effects in non-Hermitian systems with patterned gain and loss. By analyzing the eigenvalue dynamics of complex symmetric matrices when a system parameter is varied, we introduce a general set of theoretical conditions for these two effects. We show that these effects arise in any irreducible system where the gain or loss is added to a subset of the elements of the system, without the need for parity-time symmetry or for the system to be near an exceptional point. These results are confirmed using full-wave numerical simulations. The conditions presented here vastly expand the design space for observing these effects. We also show that a similarly broad class of systems exhibit a loss-induced narrowing of the density of states." @default.
- W2403977436 created "2016-06-24" @default.
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- W2403977436 date "2016-09-30" @default.
- W2403977436 modified "2023-10-11" @default.
- W2403977436 title "Eigenvalue dynamics in the presence of nonuniform gain and loss" @default.
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- W2403977436 doi "https://doi.org/10.1103/physreva.94.033857" @default.
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