The Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain

Details The Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain The Kondo Box: A Magnetic Impurity in an Ultrasmall Metallic Grain

1998-09-30

arxiv.org/abs/cond-mat/9809416v1

Phys. Rev. Lett. 82, 2143 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 Latex pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.2143

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.

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