Rashba-control for the spin excitation of a fully spin polarized vertical quantum dot

TL;DR

This paper investigates how Rashba spin-orbit coupling influences the spin excitation spectrum of a fully spin-polarized vertical quantum dot, revealing control mechanisms for spin textures and energy gaps via infrared absorption.

Contribution

It demonstrates the tunability of spin density and energy gaps in quantum dots through Rashba spin-orbit coupling, providing insights into spin control in quantum nanostructures.

Findings

Rashba coupling modifies the energy and spin density of excited states.

Spin textures with angular momentum are affected by spin-orbit interaction.

The energy gap in the spectrum can be increased by Rashba coupling.

Abstract

Far infrared radiation absorption of a quantum dot with few electrons in an orthogonal magnetic field could monitor the crossover to the fully spin polarized state. A Rashba spin-orbit coupling can tune the energy and the spin density of the first excited state which has a spin texture carrying one extra unit of angular momentum. The spin orbit coupling can squeeze a flipped spin density at the center of the dot and can increase the gap in the spectrum.