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

TL;DR

This paper explores how the thermoelectric and spectral properties of double quantum dots are affected by geometry tuning, revealing complex behaviors like sign reversals in the Seebeck coefficient due to Kondo physics.

Contribution

It demonstrates the impact of geometry on Kondo-related thermoelectric signatures in double quantum dots using the non-crossing approximation.

Findings

Kondo peak remains robust across geometries

Seebeck coefficient shows sign reversals

Strong sensitivity of satellite features and Kondo temperature to geometry

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.