Conductance fluctuations in quasi-two-dimensional systems: a practical view

TL;DR

This paper evaluates conductance fluctuations in quasi-two-dimensional systems, proposing the inflection point of the correlation function as a more reliable experimental metric for phase coherence than traditional variance.

Contribution

It introduces the inflection point of the correlation function as a robust alternative metric for analyzing conductance fluctuations in quasi-two-dimensional systems.

Findings

Variance has large statistical errors in these systems.

The inflection point provides a more stable measure of phase coherence.

The proposed metric improves experimental analysis robustness.

Abstract

The universal conductance fluctuations of quasi-two-dimensional systems are analyzed with experimental considerations in mind. The traditional statistical metrics of these fluctuations (such as variance) are shown to have large statistical errors in such systems. An alternative characteristic is identified, the inflection point of the correlation function in magnetic field, which is shown to be significantly more useful as an experimental metric and to give a more robust measure of phase coherence.