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

Tomáš Novotný, Federica Haupt, and Wolfgang Belzig
Phys. Rev. B 84, 113107 – Published 16 September 2011
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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.

  • Figure
  • Received 11 August 2011

DOI:https://doi.org/10.1103/PhysRevB.84.113107

©2011 American Physical Society

Authors & Affiliations

Tomáš Novotný1,2,*, Federica Haupt3,4,†, and Wolfgang Belzig4

  • 1Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, CZ-12116 Praha 2, Czech Republic
  • 2Institut NÉEL, CNRS, and Université Joseph Fourier, B.P. 166, F-38042 Grenoble Cedex 9, France
  • 3Institut für Theorie der statistischen Physik, RWTH Aachen University, D-52056 Aachen, Germany
  • 4Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany

  • *tno@karlov.mff.cuni.cz
  • haupt@physik.rwth-aachen.de

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Issue

Vol. 84, Iss. 11 — 15 September 2011

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