Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain

Wolfgang B. Thimm, Johann Kroha, and Jan von Delft
Phys. Rev. Lett. 82, 2143 – Published 8 March 1999
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Abstract

We study the Kondo effect generated by a single magnetic impurity embedded in an ultrasmall metallic grain, to be called a “Kondo box.” We find that the Kondo resonance is strongly affected when the mean level spacing in the grain becomes larger than the Kondo temperature, in a way that depends on the parity of the number of electrons on the grain. We show that the single-electron tunneling conductance through such a grain features Kondo-induced Fano-type resonances of measurable size, with an anomalous dependence on temperature and level spacing.

  • Received 30 September 1998

DOI:https://doi.org/10.1103/PhysRevLett.82.2143

©1999 American Physical Society

Authors & Affiliations

Wolfgang B. Thimm1, Johann Kroha2, and Jan von Delft1

  • 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany
  • 2Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, Postfach 6980, 76128 Karlsruhe, Germany

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Vol. 82, Iss. 10 — 8 March 1999

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