Quantum Dots as Tunable Kondo Impurities

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Science  22 Sep 2000:
Vol. 289, Issue 5487, pp. 2064-2065
DOI: 10.1126/science.289.5487.2064

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Advances in mesoscopic physics are enabling fundamental properties of solids to be studied at an unprecedented level of detail. In his Perspective, von Delft highlights the study by van der Wiel et al., who have demonstrated almost complete screening of the local spin of a quantum dot. This behavior mirrors the well-known Kondo effect for magnetic impurities in metals. Because they are tunable, quantum dots allow detailed tests of models for the Kondo effect, but experiments are ahead of theory at this time.