The influence of localized states charging on 1/f^{\alpha} tunneling current noise spectrum

TL;DR

This paper presents a theoretical study on how charging of localized impurity states influences the 1/f^{eta} noise spectrum in tunneling currents, highlighting Coulomb interactions as key factors.

Contribution

It introduces a model linking Coulomb interactions of localized states with the power law behavior of tunneling current noise spectra.

Findings

Charging of localized states causes power law singularities in noise spectra.

The noise spectrum exponent depends on Coulomb interaction strengths.

Switching Coulomb interactions alters the low-frequency noise behavior.

Abstract

We report the results of theoretical investigations of low frequency tunneling current noise spectra component (1/f^{\alpha}). Localized states of individual impurity atoms play the key role in low frequency tunneling current noise formation. It is found that switching "on" and "off" of Coulomb interaction of conduction electrons with one or two charged localized states results in power law singularity of low-frequency tunneling current noise spectrum 1/f^{\alpha}. Power law exponent in different low frequency ranges depends on the relative values of Coulomb interaction of conduction electrons with different charged impurities.