Abstract
A numerically exact calculation of the transport properties of a quantum wire interacting with a lateral two-level quantum dot is presented. The wire conductance is calculated for all different states of charge and spin of the quantum dot. For a dot with two electrons we obtain an enhancement of the Kondo temperature at the singlet-triplet transition and a nonuniversal scaling law for its dependence upon the dot energy spacing. We find that the Kondo correlation is stronger for a dot spin than for In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and the wire conductance is partially quenched except in a very small region of gate potential where it reaches the maximum value
- Received 1 February 2002
DOI:https://doi.org/10.1103/PhysRevB.65.233310
©2002 American Physical Society