Abstract
We consider the spin and orbital Kondo effect in a parallelarrangement of two strongly electrostatically coupled quantumdots. Increasing the exchange of electrons between the dotsthrough the attached leads induces a transition between theSU(4) spin and orbital Kondo effect and SU(2) spin Kondoeffect. Being the same for the SU(4) and SU(2) symmetrypoints, the Kondo temperature drops slightly in the intermediateregime. Experimentally, two kinds of Kondo effects can bediscriminated by the sensitivity to the suppression of the spinKondo effect by Zeeman field. The dependence of the Kondotemperature on Zeeman field and the strength of electronicexchange mediated by the leads is analyzed in detail.
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