Thermoelectric Signatures of Kondo Physics in Geometry-Tunable Double Quantum Dots

Abstract

The equilibrium thermoelectric and spectral properties of a double quantum dot system are investigated, with the geometry continuously tuned from series to parallel via a parameter $p$. Within the non-crossing approximation in the infinite-$U$ limit, the Kondo peak remains robust, while satellite features and the Kondo temperature show strong sensitivity to the geometry. The Seebeck coefficient exhibits sign reversals and non-monotonic behavior as a result of the interplay between Kondo and satellite peaks. These findings underscore the role of interference and coupling asymmetry in governing transport properties, suggesting routes for geometry-based optimization in nanoscale devices.

9 pages, 10 figures, accepted for publication in Phys. Status Solidi B