We study the dependence of the Kondo temperature on the gate voltage in a strongly blockaded quantum dot with a small single-particle level spacing. We show that the dependence cannot be fitted to that of the Anderson impurity model with the gate voltage-independent level width. The effect originates in high-order tunneling processes, which make a dominant contribution to the exchange amplitude when the gate voltage is tuned away from the middle of the Coulomb blockade valley.
@article{arxiv.1103.1837,
title = {Kondo temperature of a quantum dot},
author = {Seungjoo Nah and Michael Pustilnik},
journal= {arXiv preprint arXiv:1103.1837},
year = {2012}
}