Nonequilibrium cotunneling through a three-level quantum dot

S. Schmaus, V. Koerting, J. Paaske, T. S. Jespersen, J. Nygård, and P. Wölfle
Phys. Rev. B 79, 045105 – Published 8 January 2009

Abstract

We calculate the nonlinear cotunneling conductance through a quantum dot with three electrons occupying the three highest-lying energy levels. Starting from a three-orbital Anderson model, we apply a generalized Schrieffer-Wolff transformation to derive an effective Kondo model for the system. Within this model we calculate the nonequilibrium occupation numbers and the corresponding cotunneling current to leading order in the exchange couplings. We identify the inelastic cotunneling thresholds and their splittings with applied magnetic field, and make a qualitative comparison to recent experimental data on carbon nanotube and InAs quantum-wire quantum dots. Further predictions of the model such as cascade resonances and a magnetic-field dependence of the orbital level splitting are not yet observed but within reach of recent experimental work on carbon nanotube and InAs-nanowire quantum dots.

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  • Received 11 September 2008

DOI:https://doi.org/10.1103/PhysRevB.79.045105

©2009 American Physical Society

Authors & Affiliations

S. Schmaus1, V. Koerting2,*, J. Paaske3, T. S. Jespersen3, J. Nygård3, and P. Wölfle1

  • 1Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, D-76128 Karlsruhe, Germany
  • 2Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
  • 3The Niels Bohr Institute and Nano-Science Center, University of Copenhagen, DK-2100 Copenhagen, Denmark

  • *Author to whom correspondence should be addressed; verena.koerting@unibas.ch

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Vol. 79, Iss. 4 — 15 January 2009

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