Exotic Kondo States in GaAs Quantum Dots

ORAL

Abstract

Using a unique double quantum dot geometry, we probe an exotic Kondo effect involving one quantum dot containing excess spin-1/2 simultaneously coupled to both open and confined reservoirs of electrons. Transport measurements through open reservoirs (normal leads) reveal single channel Kondo behavior. However, the addition of a third lead consisting of a large quantum dot drastically changes transport through the other, Kondo- correlated quantum dot. We explore Kondo correlations both when Coulomb blockade confines a defined number of electrons on the large dot and when charge is allowed to fluctuate. Research supported by an NSF CAREER award DMR-0349354. RMP acknowledges support from an ARO Graduate Research Fellowship.

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Authors

  • R. M. Potok

    • Harvard University and Stanford University
    • Stanford University and Harvard University

  • I. G. Rau

    • Stanford University

  • D. Goldhaber-Gordon

    • Stanford University
    • Department of Physics, Stanford University

  • C. M. Marcus

    • Harvard University

  • H. Shtrikman

    • Weizmann Institute