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Transport properties of an interacting triple quantum dot system coupled tothree leads in a triangular geometry has been studied in the Kondo regime.Applying mean-field finite-U slave boson and embedded cluster approximations tothe calculation of transport properties unveils a set of rich featuresassociated to the high symmetry of this system. Results using both calculationtechniques yield excellent overall agreement and provide additional insightsinto the physical behavior of this interesting geometry. In the case when justtwo current leads are connected to the three-dot system, interference effectsbetween degenerate molecular orbitals are found to strongly affect the overallconductance. An S=1 Kondo effect is also shown to appear for the perfectequilateral triangle symmetry. The introduction of a third current lead resultsin an `amplitude leakage' phenomenon, akin to that appearing in beam splitters,which alters the interference effects and the overall conductance through thesystem.

Kondo regime in triangular arrangements of quantum dots: Molecular orbitals, interference and contact effects