Hamburg 2001 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 2: Symposium: Kondo Physics in Quantum Dots

HL 2.4: Fachvortrag

Montag, 26. März 2001, 12:00–12:30, S2

Kondo resonances in single and electrostatically coupled quantum dots — •Jörg Schmid, Matthias Keller, Ulf Wilhelm, Jürgen Weis, Karl Eberl, and Klaus von Klitzing — Max-Planck-Institut für Festkörperforschung, D-70569 Stuttgart, Germany

We present new results on Kondo resonances [1] in the transport through different types of quantum dots: (a) Kondo resonances are not restricted to odd electron numbers [2]. This observation is understood when not only the different spin configurations, but also the different tunnel-couplings of electronic states are taken into account. (b) Electrostatically coupled quantum dots with separate leads are discussed as a new experimental realization of the Anderson impurity model [3] with additional control over degeneracy and tunnel-coupling.

[1] J. Schmid, J. Weis, K. Eberl, K. von Klitzing, Physica B 256-258, 182(1998).

[2] J. Schmid, J. Weis, K. Eberl and K. v. Klitzing, Phys. Rev. Lett. 84,5824-5827 (2000).

[3] U. Wilhelm, J. Schmid, J. Weis and K. v. Klitzing, to be published in Physica E.