Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1999-11-24
Phys. Rev. B 62 (2000) 8184-8191
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
extended version 4 -> 8 pages, examples and figure added
Scientific paper
10.1103/PhysRevB.62.8184
We investigate the current injection into a ballistic conductor under the space-charge limited regime, when the distribution function of injected carriers is an arbitrary function of energy F_c(epsilon). The analysis of the coupled kinetic and Poisson equations shows that the injected current fluctuations may be essentially suppressed by Coulomb correlations, and the suppression level is determined by the shape of F_c(epsilon). This is in contrast to the time-averaged quantities: the mean current and the spatial profiles are shown to be insensitive to F_c(epsilon) in the leading-order terms at high biases. The asymptotic high-bias behavior for the energy resolved shot-noise suppression has been found for an arbitrary (non-Poissonian) injection, which may suggest a new field of investigation on the optimization of the injected energy profile to achieve the desired noise-suppression level.
Bulashenko Oleg M.
Kochelap V. A.
Rubi Miguel J.
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