Double quantum dots: interdot interactions, co-tunneling, and Kondo resonances without spin
Mesoscale and Nanoscale Physics
2009-11-07 v1 Strongly Correlated Electrons
Abstract
We show that through an interdot off-site electron correlation in a double quantum-dot (DQD) device, Kondo resonances emerge in the local density of states without the electron spin-degree of freedom. We identify the physical mechanism behind this phenomenon: rather than forming a spin singlet in the device as required in the conventional Kondo physics, we found that exchange of electron position between the two quantum dots, together with the off-site Coulomb interaction, are sufficient to induce the Kondo resonance. Due to peculiar co-tunneling events, the Kondo resonance in one dot may be pinned at the chemical potential of the other one.
Cite
@article{arxiv.cond-mat/0109145,
title = {Double quantum dots: interdot interactions, co-tunneling, and Kondo resonances without spin},
author = {Qing-feng Sun and Hong Guo},
journal= {arXiv preprint arXiv:cond-mat/0109145},
year = {2009}
}
Comments
12 pages, 3 figures, LaTex