Parametric spin excitations in lateral quantum dots

TL;DR

This paper investigates how parametric modulation of lateral quantum dots can induce spin rotations via spin-orbit coupling, offering a method to measure coupling parameters and enhance spin polarization.

Contribution

It introduces a novel approach to control and measure spin dynamics in quantum dots through parametric excitations, with detailed numerical and theoretical analysis.

Findings

Achieves spin rotations with Rabi frequencies of tens of megahertz.

Demonstrates methods to determine spin-orbit coupling parameters.

Shows potential for increasing spin polarization in quantum dots.

Abstract

In this work, the spin dynamics of a single electron under parametric modulation of a lateral quantum dot's electrostatic potential in the presence of spin-orbit coupling is investigated. Numerical and theoretical calculations demonstrate that, by squeezing and/or moving the electron's wave function, spin rotations with Rabi frequencies on the order of tens of megahertz can be achieved with experimentally accessible parameters in both parabolic and square lateral quantum dots. Applications of parametric excitations for determining spin-orbit coupling parameters and for increasing the spin polarization in the electronic ground are demonstrated.