On the "anomalous" resurgence of shot noise in long conductors

Details On the "anomalous" resurgence of shot noise in long conductors On the "anomalous" resurgence of shot noise in long conductors

2000-05-08

arxiv.org/abs/cond-mat/0005124v4

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to appear in Aust. J. Phys. Expanded final sects. Refer any feedback to: mukunda.das@anu.edu.au

Scientific paper

There has been renewed interest in the physics of the so-called crossover for current fluctuations in mesoscopic conductors, most recently involving the possibility of its appearance in the passage to the macroscopic limit. Shot noise is normally absent from solid-state conductors in the large, and its anomalous resurgence there has been ascribed to a rich interplay of drift, diffusion, and Coulomb screening. We demonstrate that essentially the same rise in shot noise occurs in a much less complex system: the Boltzmann-Drude-Lorentz model of a macroscopic, uniform gas of strictly noninteracting carriers. We conclude that the "anomalous crossover" is a manifestation of simple kinetics. Poissonian carriers, if driven by a high enough field, cross the sample faster than any scattering time, thus fulfilling Schottky's condition for ideal shot noise.

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