title: Cotunneling Drag Effect in Coulomb-Coupled Quantum Dots.
abstract: In Coulomb drag, a current flowing in one conductor can induce a voltage across an adjacent conductor via the Coulomb interaction. The mechanisms yielding drag effects are not always understood, even though drag effects are sufficiently general to be seen in many low-dimensional systems. In this Letter, we observe Coulomb drag in a Coulomb-coupled double quantum dot and, through both experimental and theoretical arguments, identify cotunneling as essential to obtaining a correct qualitative understanding of the drag behavior.
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Keller
authors.affiliation: School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea.
authors.forename: J S
authors.initials: JS
authors.lastname: Lim
authors.affiliation: IFISC (UIB-CSIC), E-07122 Palma de Mallorca, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Sánchez
authors.affiliation: IFISC (UIB-CSIC), E-07122 Palma de Mallorca, Spain.
authors.forename: Rosa
authors.initials: R
authors.lastname: López
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: S
authors.initials: S
authors.lastname: Amasha
authors.affiliation: HGST, San Jose, California 95135, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Katine
authors.affiliation: Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 96100, Israel.
authors.forename: Hadas
authors.initials: H
authors.lastname: Shtrikman
authors.affiliation: Department of Physics, Stanford University, Stanford, California 94305, USA.
authors.forename: D
authors.initials: D
authors.lastname: Goldhaber-Gordon