Correlation-induced conductance suppression at level degeneracy in a quantum dot

H.A. Nilsson, O. Karlström, M. Larsson, P. Caroff, Jonas Nyvold Pedersen, L. Samuelson, A. Wacker, L.-E. Wernersson, H.Q. Xu

Research output: Contribution to journalJournal articleResearchpeer-review

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. © 2010 The American Physical Society.
Original languageEnglish
JournalPhysical Review Letters
Volume104
Issue number18
Pages (from-to)186804
ISSN0031-9007
DOIs
Publication statusPublished - 2010
Externally publishedYes

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