Exchange and the Coulomb blockade: Peak height statistics in quantum dots

TL;DR

This paper investigates how exchange interactions influence Coulomb blockade peak height fluctuations in chaotic quantum dots, demonstrating improved experimental agreement and evidence for high spin states.

Contribution

It introduces the role of exchange interactions in peak height statistics, showing their importance in matching experimental data and revealing high spin states in quantum dots.

Findings

Exchange reduces level repulsion in the spectrum.

Including exchange improves data description.

Evidence for high spin states (S>1) in quantum dots.

Abstract

We study the effect of the exchange interaction on the Coulomb blockade peak height statistics in chaotic quantum dots. Because exchange reduces the level repulsion in the many body spectrum, it strongly affects the fluctuations of the peak conductance at finite temperature. We find that including exchange substantially improves the description of the experimental data. Moreover, it provides further evidence of the presence of high spin states (S>1) in such systems.