Indirect coupling between spins in semiconductor quantum dots

TL;DR

This paper presents a theoretical study of the optically induced indirect exchange interaction between spins in semiconductor quantum dots, highlighting the significance of correlation effects and geometry on coupling strength.

Contribution

It introduces a microscopic formulation of spin interactions in quantum dots that accounts for correlation effects and provides quantitative results for various geometries.

Findings

Correlation effects are comparable to direct exchange.

Largest couplings occur in one-dimensional systems.

Quantitative analysis for realistic quantum dot geometries.

Abstract

The optically induced indirect exchange interaction between spins in two quantum dots is investigated theoretically. We present a microscopic formulation of the interaction between the localized spin and the itinerant carriers including the effects of correlation, using a set of canonical transformations. Correlation effects are found to be of comparable magnitude as the direct exchange. We give quantitative results for realistic quantum dot geometries and find the largest couplings for one dimensional systems.