Nonequilibrium phonon backaction on the current noise in atomic-sized junctions
Abstract
We study backaction effects of phonon heating due to tunneling electrons on the current noise in atomic-sized junctions. Deriving a generalized kinetic approximation within the extended Keldysh Green's functions technique, we demonstrate the existence of a characteristic backaction contribution to the noise in case of low external phonon damping. We provide a physically intuitive interpretation of this contribution at large voltage in terms of slow fluctuations of the phonon occupation, and show that it generally gives a significant correction to the noise above the phonon emission threshold.
Keywords
Cite
@article{arxiv.1105.3912,
title = {Nonequilibrium phonon backaction on the current noise in atomic-sized junctions},
author = {Tomas Novotny and Federica Haupt and Wolfgang Belzig},
journal= {arXiv preprint arXiv:1105.3912},
year = {2015}
}
Comments
v2 - update: 4 pages, 1 figure, minor changes in the main text nearly identical to the published version; the manuscript is supplemented by an updated Mathematica notebook and a new supplementary note in PDF, which are parts of the associated .zip bundle