Kondo Effect in Multiple-Dot Systems
Abstract
We study the Kondo effect in multiple-dot systems for which the inter- as well as intra-dot Coulomb repulsions are strong, and the inter-dot tunneling is small. The application of the Ward-Takahashi identity to the inter-dot dynamical susceptibility enables us to analytically calculate the conductance for a double-dot system by using the Bethe-ansatz exact solution of the SU(4) impurity Anderson model. It is clarified how the inter-dot Kondo effect enhances or suppresses the conductance under the control of the gate voltage and the magnetic field. We then extend our analysis to multiple-dot systems including more than two dots, and discuss their characteristic transport properties by taking a triple-dot system as an example.
Cite
@article{arxiv.cond-mat/0502413,
title = {Kondo Effect in Multiple-Dot Systems},
author = {Rui Sakano and Norio Kawakami},
journal= {arXiv preprint arXiv:cond-mat/0502413},
year = {2009}
}
Comments
8 pages, 9 figures