Volume 71, Number 4, August 2005
|Page(s)||672 - 678|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||20 July 2005|
vs. Kondo effect in double quantum dot
1. Institut für Theoretische Physik, Universität Hamburg Jungiusstr. 9, 20355 Hamburg, Germany
Accepted: 22 June 2005
We consider the spin and orbital Kondo effect in a parallel arrangement of two strongly electrostatically coupled quantum dots. Increasing the exchange of electrons between the dots through the attached leads induces a transition between the spin and orbital Kondo effect and spin Kondo effect. Being the same for the and symmetry points, the Kondo temperature drops slightly in the intermediate regime. Experimentally, two kinds of Kondo effects can be discriminated by the sensitivity to the suppression of the spin Kondo effect by Zeeman field. The dependence of the Kondo temperature on Zeeman field and the strength of electronic exchange mediated by the leads is analyzed in detail.
PACS: 73.23.-b – Electronic transport in mesoscopic systems / 73.63.Kv – Quantum dots / 72.15.Qm – Scattering mechanisms and Kondo effect
© EDP Sciences, 2005
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