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Experimental evidence and consequences of rare events in quantum tunneling

  • V. Da Costa
  • Y. Henry
  • F. Bardou
  • M. Romeo
  • K. Ounadjela

Abstract:

Tiny spatial fluctuations of tunnel barrier parameters are shown to have dramatic consequences on the statistical properties of quantum tunneling. A direct experimental evidence is provided that the tunnel current through metal-oxide junctions, imaged at a nanometric scale, exhibits broad statistical distributions extending over more than 4 orders of magnitude. Striking effects of broad current distributions are shown: the total tunnel transmission is dominated by few highly transmitting sites and the typical current density varies strongly with the size of the junction. Moreover, self-averaging of the tunnel current fluctuations occurs only for unexpectedly large junction areas.

PACS. 05.40.-a Fluctuation phenomena, random processes, noise, and Brownian motion – 73.40.Gk Tunneling – 73.40.Rw Metal-insulator-metal structures 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2000

Authors and Affiliations

  • V. Da Costa
    • 1
  • Y. Henry
    • 1
  • F. Bardou
    • 1
  • M. Romeo
    • 1
  • K. Ounadjela
    • 1
  1. 1.Institut de Physique et Chimie des Matériaux de Strasbourg, 23 rue du Loess, 67037 Strasbourg (UMR 7504 CNRS – Université Louis Pasteur) Cedex, France (email: victor@michelangelo.u-strasbg.fr)FR

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