Strong Enhancement of Rashba spin-orbit coupling with increasing anisotropy in the Fock-Darwin states of a quantum dot

TL;DR

This study demonstrates that increasing anisotropy in elliptical quantum dots significantly enhances Rashba spin-orbit coupling effects, observable through optical transitions even at low magnetic fields.

Contribution

It reveals that quantum dot anisotropy amplifies Rashba spin-orbit coupling signatures in Fock-Darwin spectra and optical transitions, providing new insights into spin-orbit interactions in anisotropic systems.

Findings

Rashba spin-orbit effects are strong even at low magnetic fields.

Anisotropy enhances the Rashba coupling signatures in spectra.

Optical transitions are significantly affected by the spin-orbit interaction.

Abstract

We have investigated the electronic properties of elliptical quantum dots in a perpendicular external magnetic field, and in the presence of the Rashba spin-orbit interaction. Our work indicates that the Fock-Darwin spectra display strong signature of Rashba spin-orbit coupling even for a low magnetic field, as the anisotropy of the quantum dot is increased. An explanation of this pronounced effect with respect to the anisotropy is presented. The strong spin-orbit coupling effect manifests itself prominently in the corresponding dipole-allowed optical transitions, and hence is susceptible to direct experimental observation.