Gain-driven discrete breathers in PT-symmetric nonlinear metamaterials

N. Lazarides, G. P. Tsironis

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    151 Scopus citations

    Abstract

    We introduce a one-dimensional parity-time- (PT-)symmetric nonlinear magnetic metamaterial consisting of split-ring dimers having both gain and loss. When nonlinearity is absent we find a transition between an exact to a broken PT phase; in the former, the system features a two band gapped spectrum with shape determined by the gain and loss coefficients as well as the interunit coupling. In the presence of nonlinearity, we show numerically that as a result of the gain and dissipation matching a novel type of long-lived stable discrete breathers can form below the lower branch of the band with no attenuation. In these localized modes the energy is almost equally partitioned between two adjacent split rings on the one with gain and the other one with loss.

    Original languageBritish English
    Article number053901
    JournalPhysical Review Letters
    Volume110
    Issue number5
    DOIs
    StatePublished - 30 Jan 2013

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