Charge Distribution in a Kondo Correlated Quantum Dot

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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6 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.88.176805

We report here on a direct and non-invasive measurement of the charge and its distribution in a Kondo correlated quantum dot (QD). A non-invasive potential-sensitive detector in proximity with the QD reveals that even though the conductance of the QD is significantly enhanced as it enters the Kondo regime the net charge in the QD remains unaffected. This demonstrates the separation between spin and charge degrees of freedom in the Kondo effect. We find however, under certain experimental conditions, that an abrupt redistribution of the charge in the QD is taking place simultaneously with the onset of Kondo correlation. This suggests that the spin-charge separation in the Kondo effect does not always hold.

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