Effects of spin and exchange interaction on the Coulomb-blockade peak statistics in quantum dots

TL;DR

This paper derives a formula for quantum dot conductance considering exchange interactions, showing improved agreement with experiments on peak statistics compared to models without exchange effects.

Contribution

It introduces a closed-form expression for conductance in quantum dots including exchange interactions, enhancing the understanding of Coulomb-blockade peak statistics.

Findings

Exchange interaction improves agreement with experimental peak statistics.

Temperature dependence of conductance peaks is characterized.

Exchange effects significantly alter peak-spacing distributions.

Abstract

We derive a closed expression for the linear conductance through a quantum dot in the Coulomb-blockade regime in the presence of a constant exchange interaction. With this expression we calculate the temperature dependence of the conductance peak-height and peak-spacing statistics. Using a realistic value of the exchange interaction, we find significantly better agreement with experimental data as compared with the statistics obtained in the absence of an exchange interaction.