| Issue |
EPL
Volume 86, Number 6, June 2009
|
|
|---|---|---|
| Article Number | 67004 | |
| Number of page(s) | 6 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/86/67004 | |
| Published online | 09 July 2009 | |
Coulomb drag in parallel quantum dots
1
National Institute of Materials Physics - P.O. Box MG-7, 077125 Bucharest-Magurele, Romania, EU
2
Department of Physics, Bilkent University - Bilkent, 06800 Ankara, Turkey
Received:
26
March
2009
Accepted:
2
June
2009
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.
PACS: 73.23.Hk – Coulomb blockade; single-electron tunneling / 85.35.Ds – Quantum interference devices / 85.35.Be – Quantum well devices (quantum dots, quantum wires, etc.)
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.