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

Abstract

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.

5 pages, 3 figures, submitted 05May2010

References in corpus (8)

• The numerical renormalization group method for quantum impurity systems
• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Strongly correlated regimes in a double quantum-dot device
• Observation of the underscreened Kondo effect in a molecular transistor
• Properties of anisotropic magnetic impurities on surfaces
• Theory of anisotropic exchange in laterally coupled quantum dots
• Splitting of the Kondo resonance in anisotropic magnetic impurities on surfaces
• Spin Exciton in quantum dot with spin orbit coupling in high magnetic field

Cited by in corpus (4)

• Enhancement of the Kondo effect through Rashba spin-orbit interactions
• Universal transport signatures in two-electron molecular quantum dots: gate-tunable Hund's rule, underscreened Kondo effect and quantum phase transitions
• Dynamical magnetic anisotropy and quantum phase transitions in a vibrating spin-1 molecular junction
• Gate-tunable split Kondo effect in a carbon nanotube quantum dot