Spin-Spin Interaction In Artificial Molecules With In-Plane Magnetic Field

TL;DR

This paper theoretically studies how an in-plane magnetic field affects the spin-spin interaction between two electrons in coupled quantum dots, revealing the influence on tunneling and the singlet-triplet phase diagram.

Contribution

It provides a detailed numerical analysis of the impact of in-plane magnetic fields on electron spin interactions in artificial molecules, using realistic models and exact diagonalization.

Findings

In-plane magnetic fields modify tunneling between quantum dots.

The singlet-triplet phase diagram depends on field strength and direction.

The study offers insights into controlling spin interactions via magnetic field orientation.

Abstract

We investigate theoretically the spin-spin interaction of two-electrons in vertically coupled QDs as a function of the angle between magnetic field and growth axis. Our numerical approach is based on a real-space description of single-particle states in realistic samples and exact diagonalization of carrier-carrier Coulomb interaction. In particular, the effect of the in-plane field component on tunneling and, therefore, spin-spin interaction will be discussed; the singlet-triplet phase diagram as a function of the field strength and direction is drawn.