A Tunable Kondo Effect in Quantum Dots

Leo P. Kouwenhoven; Sara M. Cronenwett; Tjerk H. Oosterkamp

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A Tunable Kondo Effect in Quantum Dots

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arxiv cond-mat/9804211 v1 pith:BSIEZCLD submitted 1998-04-20 cond-mat.mes-hall

Sara M. Cronenwett , Tjerk H. Oosterkamp , Leo P. Kouwenhoven This is my paper

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We demonstrate a tunable Kondo effect realized in small quantum dots. We can switch our dot from a Kondo impurity to a non-Kondo system as the number of electrons on the dot is changed from odd to even. We show that the Kondo temperature can be tuned by means of a gate voltage as a single-particle energy state nears the Fermi energy. Measurements of the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and non-equilibrium Kondo effects.

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