Spin-orbit Interaction induced Singlet-Triplet Resonant Raman Transitions in Quantum-dot Helium

TL;DR

This paper theoretically demonstrates that spin-orbit interactions enable singlet-triplet resonant Raman transitions in two-electron quantum dots, with magnetic fields enhancing their dominance, offering a way to control spin states in quantum dots.

Contribution

It reveals that spin-orbit coupling allows singlet-triplet Raman transitions in quantum dots, which can be tuned by magnetic fields, advancing understanding of spin control in quantum nanostructures.

Findings

Singlet-triplet Raman transitions are allowed only with spin-orbit interactions.

Magnetic fields increase the dominance of singlet-triplet transitions.

Potential for tuning Raman transitions and spin-orbit coupling in quantum dots.

Abstract

From our theoretical studies of resonant Raman transitions in two-electron quantum dots (artificial helium atoms) we show that in this system, the singlet-triplet Raman transitions are allowed (in polarized configuration) only in the presence of spin-orbit interactions. With an increase of the applied magnetic field this transition dominates over the singlet-singlet and triplet-triplet transitions. This intriguing effect can therefore be utilized to tune Raman transitions as well as the spin-orbit coupling in few-electron quantum dots.