Suppression of Kondo-assisted co-tunneling in a spin-1 quantum dot with Spin-Orbit interaction

Details Suppression of Kondo-assisted co-tunneling in a spin-1 quantum dot with Spin-Orbit interaction Suppression of Kondo-assisted co-tunneling in a spin-1 quantum dot with Spin-Orbit interaction

2010-07-18

arxiv.org/abs/1007.3003v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, submitted 05May2010

Scientific paper

Kondo-type zero-bias anomalies have been frequently observed in quantum dots occupied by two electrons and attributed to a spin-triplet configuration that may become stable under particular circumstances. Conversely, zero-bias anomalies have been so far quite elusive when quantum dots are occupied by an even number of electrons greater than two, even though a spin-triplet configuration is more likely to be stabilized there than for two electrons. We propose as an origin of this phenomenon the spin-orbit interaction, and we show how it profoundly alters the conventional Kondo screening scenario in the simple case of a laterally confined quantum dot with four electrons.

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