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

Summary, in English

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.

• Author: Henrik Nilsson; Olov Karlström; M Larsson; Philippe Caroff; Jonas Pedersen; Lars Samuelson; Andreas Wacker; Lars-Erik Wernersson; Hongqi Xu
• Department/s: Solid State Physics; Mathematical Physics; Department of Electrical and Information Technology; NanoLund: Centre for Nanoscience
• Publishing year: 2010
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 104
• Issue: 18
• Full text: - 479 kB; Download statistics
• Links: http://dx.doi.org/10.1103/PhysRevLett.104.186804
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Condensed Matter Physics
• Status: Published
• Research group: Linne Center for Nanoscience and Quantum Engineering; Nanometer structure consortium (nmC); Nano
• ISBN/ISSN/Other: ISSN: 1079-7114