Correlations due to localization in quantum eigenfunctions of disordered microwave cavities
Prabhakar Pradhan, S. Sridhar
Abstract
Non-universal correlations due to localization are observed in statistical properties of experimental eigenfunctions of quantum chaotic and disordered microwave cavities. Varying energy E and mean free path l enable us to experimentally tune from localized to delocalized states. Large level-to-level Inverse Participation Ratio (IPR I2) fluctuations are observed for the disordered billiards, whose distribution is strongly asymmetric about <I2>. The density auto-correlations of eigenfunctions are shown to decay exponentially and the decay lengths are experimentally determined. All the results are quantitatively consistent with calculations based upon nonlinear sigma-models.
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