Single-Parameter Scaling and Maximum Entropy inside Disordered One-Dimensional Systems: Theory and Experiment

Abstract

The single-parameter scaling hypothesis relating the average and variance of the logarithm of the conductance is a pillar of the theory of electronic transport. We use a maximum-entropy ansatz to explore the logarithm of the energy density, $\ln \mathcal{W}(x)$, at a depth $x$ into a random one-dimensional system. Single-parameter scaling would be the special case in which $x=L$ (the system length). We find the result, confirmed in microwave measurements and computer simulations, that the average of $\ln \mathcal{W}(x)$ is independent of $L$ and equal to $-x/\ell$, with $\ell$ the mean free path. At the beginning of the sample, $\mathrm{var}[\ln \mathcal{W}(x)]$ rises linearly with $x$ and is also independent of $L$, with a sublinear increase near the sample output. At $x=L$ we find a correction to the value of $\mathrm{var}[\ln T]$ predicted by single-parameter scaling.

arXiv comment5 pages, 3 figures. Accepted for publication as a Rapid Communication in Physical Review B. With Supplementary Matterial

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• Density of reflection resonances in one-dimensional disordered Schrödinger operators
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• Characterizing random 1D media with an embedded reflector via scattered waves