Abstract
We find that Kondo resonant conductance can occur in a quantum dot in the Coulomb blockade regime with an even number of electrons . The contacts are attached to the dot in a pillar configuration, and a magnetic field along the axis is applied. lifts the spin degeneracy of the dot energies. Usually, this prevents the system from developing the Kondo effect. Tuning to the value where levels with different total spin cross restores both the degeneracy and the Kondo effect. We analyze a dot charged with electrons. Coupling to the contacts is antiferromagnetic due to a spin selection rule and, in the Kondo state, the charge is unchanged while the total spin on the dot is .
- Received 26 October 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.4677
©2000 American Physical Society