A. Biella, F. Borgonovi, R. Kaiser, G. L. Celardo
Anderson localization is a paradigmatic coherence effect in disordered systems, often analyzed in the absence of dissipation. Here we consider the case of coherent dissipation, occuring for open system with coupling to a common decay channel. This dissipation induces cooperative Dicke super- and subradiance and an effective long range coupling, expected to destroy Anderson localization. We are thus in presence of two competing effects, i.e localization driven by disorder and delocalization driven by dissipative opening. Here we show that in an open 3D Anderson model, subradiance enables the system to preserve signatures of a localization transition. We demonstrate the existence of a {\it subradiant localized regime}, emerging from the interplay of opening and disorder, in which subradiant states are hybrid and localized, while superradiant states are extended. We also provide analytical predictions for this regime, confirmed by numerical simulations.
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http://arxiv.org/abs/1304.5451
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