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Drastic Reduction of Shot Noise in Semiconductor Superlattices

W. Song·A. K. M. Newaz·J. K. Son·E. E. Mendez
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Abstract

We have found experimentally that the shot noise of the tunneling current $I$ through an undoped semiconductor superlattice is reduced with respect to the Poissonian noise value $2eI$, and that the noise approaches 1/3 of that value in superlattices whose quantum wells are strongly coupled. On the other hand, when the coupling is weak or when a strong electric field is applied to the superlattice the noise becomes Poissonian. Although our results are qualitatively consistent with existing theories for one-dimensional mulitple barriers, the theories cannot account for the dependence of the noise on superlattice parameters that we have observed.

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W. Song, A. K. M. Newaz, J. K. Son, E. E. Mendez. 2005-10-21. Drastic Reduction of Shot Noise in Semiconductor Superlattices. https://doi.org/10.1103/physrevlett.96.126803

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