Conductance Suppression due to Correlated Electron Transport in Coupled Double-dots
Abstract
The electrostatic interaction between two capacitively-coupled metal double-dots is studied at low temperatures. Experiments show that when the Coulomb blockade is lifted by applying appropriate gate biases to both double-dots, the conductance through each double-dot becomes significantly lower than when only one double-dot is conducting. A master equation is derived for the system and the results obtained agree well with the experimental data. The model suggests that the conductance lowering in each double-dot is caused by a single-electron tunneling in the other double-dot. Here, each double-dot responds to the instantaneous, rather than average, potentials on the other double-dot. This leads to correlated electron motion within the system, where the position of a single electron in one double-dot controls the tunneling rate through the other double-dot.
Keywords
Cite
@article{arxiv.cond-mat/9911173,
title = {Conductance Suppression due to Correlated Electron Transport in Coupled Double-dots},
author = {Geza Toth and Alexei O. Orlov and Islamshah Amlani and Craig S. Lent and Gary H. Bernstein and Gregory L. Snider},
journal= {arXiv preprint arXiv:cond-mat/9911173},
year = {2007}
}
Comments
19 pages [pre-print style], 8 figures, accepted for Phys. Rev. B