Shot-noise suppression by Fermi and Coulomb correlations in ballistic conductors

2000/06/30 by O. M. Bulashenko, J. M. Rubi
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.64.045307

published as Phys. Rev. B 64, 045307 (2001) · 8 pages, 4 figures, minor changes, published version

arxiv created 2001/08/22 · arxiv updated 2009/11/30

Abstract

We investigate the injection of degenerate Fermi-Dirac electrons into a multimode ballistic conductor under the space-charge limited regime. The nonequilibrium current fluctuations were found to be suppressed by both Coulomb and Fermi correlations. We show that the Fermi shot-noise suppression factor is limited below by the value 2kT/epsilon_F, where T is the temperature and epsilon_F the Fermi energy of the injected electrons. The Coulomb noise suppression factor may attain much lower values epsilon_F/2qU, because of its dependence on the applied bias U >> kT/q. The asymptotic behaviour of the overall shot-noise suppression factor in a high degenerate limit was found to be kT/qU, independently of the material parameters.

Related

• Electron spectroscopy of the shot noise reduction effect
• Self-consistent theory of current and voltage noise in multimode ballistic conductors
• Shot-noise spectroscopy of energy-resolved ballistic currents
• High-field noise in degenerate and mesoscopic systems
• Semiclassical theory of shot noise in mesoscopic conductors