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

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

2009-11-11

arxiv.org/abs/0911.2060v2

Physical Review Letters 104, 186804 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.104.186804

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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