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Journal Articles Physical Review Letters Year : 2010

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

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, which now turns out to be part of a larger scenario. Our findings are supported by numerical and analytical calculations.
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Dates and versions

hal-00548700 , version 1 (12-07-2022)

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H.A. Nilsson, O. Karlström, M. Larsson, P. Caroff, J.N. Pedersen, et al.. Correlation-induced conductance suppression at level degeneracy in a quantum dot. Physical Review Letters, 2010, 104 (18), pp.186804. ⟨10.1103/PhysRevLett.104.186804⟩. ⟨hal-00548700⟩
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