Kondo effect in side-coupled quantum dots

We present the spectroscopy of the Kondo effect in two side-coupled quantum dots, a "big" one and a "small" one. The spectroscopy is carried out by measuring the current through the small dot only.When increasing the coupling between the two dots, the stability diagram evolves from the diagram of two uncoupled quantum dots (the well-known "honeycomb" diagram) to the stability diagram of a Kondo system. Interestingly, the Kondo ridges appear only at certain precise point of the diagram. We show that these points correspond to a very peculiar point of the diagram where the inter-dot charging energy is minimum. We have thus a "boosting" of the Kondo effect at these precises points.

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