Effect of Dot Geometry on Various Kinds of Kondo Behaviors for Parallel Triple Dot System

With the help of the Wilson's numerical renormalization group technique, we study the dynamical and magnetic properties for a parallel triple dot system with five different dot geometries in the strong correlation limit. We reveal that when the dot configuration changes, several kinds of Kondo effect could be found, i.e., the partially screened spin -3/2, the totally screened spin -1, the spin -1/2, and the spin -0 Kondo effects, implying numerically that the manners in which the dots and leads are organized play important roles in the Kondo behaviors. To understand these quantum phenomena, the local density of states, the transmission coefficient, the spin-spin correlation function, and the temperature-dependent magnetic moment for each configuration are shown, and necessary theoretical discussions are given.