Current noise and higher order fluctuations in semiconducting bilayer systems

TL;DR

This paper investigates charge transfer fluctuations in semiconductor bilayer systems under non-equilibrium conditions, comparing incoherent and coherent transport models, and predicts measurable effects of these fluctuations.

Contribution

It introduces a comparative analysis of incoherent and coherent exciton transport models in bilayer systems, highlighting the robustness of current cross correlations against disorder.

Findings

Cross correlations are minimally affected by disorder.

Similar behavior observed in both incoherent and coherent models.

Predictions made for experimental measurement of fluctuations.

Abstract

We analyze the transport properties of a semiconductor based bilayer system under non-equilibrium conditions with special emphasis on the charge transfer statistics in the regime dominated by the exciton transport. We consider two different models. In one of them the transport occurs incoherently and is dominated by incoherent tunneling processes of individual excitons, while in the other system no disorder is present and transport processes are fully coherent. We find that the strength of cross correlations of currents in different layers is only insignificantly affected by the disorder and shows up similar behaviour in both systems. We discuss possible experimental realizations and make predictions for measurable quantities.