Capacitively coupled double quantum dot system in the Kondo regime

Details Capacitively coupled double quantum dot system in the Kondo regime Capacitively coupled double quantum dot system in the Kondo regime

2011-07-12

arxiv.org/abs/1107.2426v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 12 figures

Scientific paper

A detailed study of the low-temperature physics of an interacting double quantum dot system in a T-shape configuration is presented. Each quantum dot is modeled by a single Anderson impurity and we include an inter-dot electron-electron interaction to account for capacitive coupling that may arise due to the proximity of the quantum dots. By employing a numerical renormalization group approach to a multi-impurity Anderson model, we study the thermodynamical and transport properties of the system in and out of the Kondo regime. We find that the two-stage-Kondo effect reported in previous works is drastically affected by the inter-dot Coulomb repulsion. In particular, we find that the Kondo temperature for the second stage of the two-stage-Kondo effect increases exponentially with the inter-dot Coulomb repulsion, providing a possible path for its experimental observation.

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