Drastic Reduction of Shot Noise in Semiconductor Superlattices

Details Drastic Reduction of Shot Noise in Semiconductor Superlattices Drastic Reduction of Shot Noise in Semiconductor Superlattices

2005-10-21

arxiv.org/abs/cond-mat/0510594v1

Physics

Condensed Matter

Statistical Mechanics

4 Pages, 3Figures

Scientific paper

10.1103/PhysRevLett.96.126803

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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