Effect of screening on shot noise in diffusive mesoscopic conductors

Abstract

Shot noise in diffusive mesoscopic conductors, at finite observation frequencies $\omega$ (comparable to the reciprocal Thouless time ${\tau }_T^{-1}$), is analyzed with an account of screening. At low frequencies, the well-known result $S_I(\omega )=2eI/3$ is recovered. This result is valid at arbitrary $\omega {\tau }_T$ for wide conductors longer than the screening length. However, at least for two very different systems, namely, wide and short conductors, and thin conductors over a close ground plane, noise approaches a different fundamental level, $S_I(\omega )=eI$, at $\omega {\tau }_T\gg 1$.

5 pages, 3 figures. Published version. Also available in the journal's format at http://hana.physics.sunysb.edu/~yehuda/cv/papers/shotnoise.pdf

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