"Optical conductance fluctuations: diagrammatic analysis in Landauer approach and non-universal effects"

TL;DR

This paper provides a detailed diagrammatic analysis of optical conductance fluctuations in multiple scattering media, revealing how absorption and reflections influence these fluctuations within a Landauer approach.

Contribution

It introduces a systematic diagrammatic method using Kadanoff-Baym techniques to analyze optical conductance fluctuations, including effects of absorption and internal reflections.

Findings

Fluctuations are well described by the analytical form derived.

Absorption and internal reflections significantly reduce conductance fluctuations.

The theory resolves short distance divergence issues in the analysis.

Abstract

The optical conductance of a multiple scattering medium is the total transmitted light of a diffuse incoming beam. This quantity, very analogous to the electronic conductance, exhibits universal conductance fluctuations. We perform a detailed diagrammatic analysis of these fluctuations. With a Kadanoff-Baym technique all the leading diagrams are systematically generated. A cancellation of the short distance divergencies occurs, that yields a well behaved theory. The analytical form of the fluctuations is calculated and applied to optical systems. Absorption and internal reflections reduce the fluctuations significantly.