Effect of the charge and spin of a lateral quantum dot on a wire current

The transport properties of a quantum wire interacting with a lateral two-level quantum dot are presented. A cluster including the dot and its vicinity is diagonalized and embedded into the res of the system. The result is numerically exact for T = 0. The wire conductance is calculated for all different states of charge and spin of the quantum dot. We find that the Kondo correlation is. stronger for a dot spin S-D approximate to 1 than for S-D approximate to 1/2. In both cases the wire current is totally quenched by the Kondo effect. When the dot is in the mixed-valence regime and 1/2; SD; 1 the wire conductance is partially quenched except in a very small region of the gate potentia where it reaches the maximum value e(2)/h.