Correlation-induced conductance suppression at level degeneracy in a quantum dot.
Nilsson, Henrik; Karlström, Olov; Larsson, M; Caroff, Philippe, et al. (2010). Correlation-induced conductance suppression at level degeneracy in a quantum dot.. Physical Review Letters, 104, (18)
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Published
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English
Authors:
Nilsson, Henrik
;
Karlström, Olov
;
Larsson, M
;
Caroff, Philippe
, et al.
Department:
Solid State Physics
Mathematical Physics
Department of Electrical and Information Technology
Linne Center for Nanoscience and Quantum Engineering-lup-obsolete
Nanometer structure consortium (nmC)-lup-obsolete
Nano-lup-obsolete
NanoLund: Centre for Nanoscience
Research Group:
Linne Center for Nanoscience and Quantum Engineering-lup-obsolete
Nanometer structure consortium (nmC)-lup-obsolete
Nano-lup-obsolete
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.
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