title: Drastic reduction of shot noise in semiconductor superlattices.
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 multibarrier structures, the theories cannot account for the dependence of the noise on superlattice parameters that we have observed.
authors.affiliation: Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800, USA.
authors.forename: W
authors.initials: W
authors.lastname: Song
authors.forename: A K M
authors.initials: AK
authors.lastname: Newaz
authors.forename: J K
authors.initials: JK
authors.lastname: Son
authors.forename: E E
authors.initials: EE
authors.lastname: Mendez