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American Physical Society, Physical Review Letters, 18(104)

DOI: 10.1103/physrevlett.104.186804

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Correlation-Induced Conductance Suppression at Level Degeneracy in a Quantum Dot

Journal article published in 2010 by H. A. Nilsson, O. Karlström, M. Larsson, P. Caroff ORCID, J. N. Pedersen, L. Samuelson, A. Wacker, L.-E. Wernersson, H. Q. Xu ORCID
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This paper is available in a repository.

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Abstract

The large, level-dependent g factors in an InSb nanowire quantum dot allow for the occurrence of a variety of level crossings in the dot. While we observe the standard conductance enhancement in the Coulomb blockade region for aligned levels with different spins due to the Kondo effect, a vanishing of the conductance is found at the alignment of levels with equal spins. This conductance suppression appears as a canyon cutting through the web of direct tunneling lines and an enclosed Coulomb blockade region. In the center of the Coulomb blockade region, we observe the predicted correlation-induced resonance. Our findings are supported by numerical and analytical calculations.