Abstract
A broad-band reflectionless channel which supports unidirectional wave propagation originating from the interplay between gyrotropic elements and symmetrically placed gain and loss constituents is proposed. Interchange of the active elements together with a gyrotropic inversion turns the same structure to a unidirectional absorber where incoming waves from a specific direction are annihilated. When disorder is introduced asymmetric Anderson localization is found. Realizations of such multi-functional architectures in the frame of electronic and photonic circuitry are discussed.
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