Shot-noise suppression by Fermi and Coulomb correlations in ballistic conductors
نویسنده
چکیده
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 2kBT/«F , where T is the temperature and «F the Fermi energy of the injected electrons. The Coulomb noise suppression factor may attain much lower values «F/2qU , because of its dependence on the applied bias U@kBT/q . The asymptotic behavior of the overall shot-noise suppression factor in a high degenerate limit was found to be kBT/qU , independent of the material parameters.
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