Nonequilibrium phonon backaction on the current noise in atomic-sized junctions

Details Nonequilibrium phonon backaction on the current noise in atomic-sized junctions Nonequilibrium phonon backaction on the current noise in atomic-sized junctions

2011-05-19

arxiv.org/abs/1105.3912v2

Phys. Rev. B 84, 113107 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

v2 - update: 4 pages, 1 figure, minor changes in the main text nearly identical to the published version; the manuscript is su

Scientific paper

10.1103/PhysRevB.84.113107

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.

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