Coulomb drag in parallel quantum dots

Date
2009-07-9
Advisor
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Source Title
EPL
Print ISSN
0295-5075
Electronic ISSN
Publisher
Europhysics Letters Association
Volume
86
Issue
6
Pages
67004-1 - 67004-6
Language
English
Type
Article
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Abstract

We study theoretically the electronic transport in parallel few-level quantum dots in the presence of both intradot and interdot long-range Coulomb interaction. Each dot is connected to two leads and the steady-state currents are calculated within the Keldysh formalism using the random-phase approximation for the interacting Green functions. Due to the momentum transfer between the two systems it is possible to get a nonvanishing current through an unbiased Coulomb-blockaded dot, if the other dot is set in the nonlinear transport regime. The transitions between the levels of the passive dot reduce the drag current and lead to negative differential conductance. We also discuss the dependence on temperature and the role of the lead-dot coupling. Copyright (C) EPLA, 2009

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Keywords
Electron-systems, Fluctuations, Wire
Citation
Published Version (Please cite this version)