Pulse-pumped double quantum dot with spin-orbit coupling

TL;DR

This paper investigates the complex quantum dynamics of an electron spin qubit in a double quantum dot with spin-orbit coupling under a pulsed electric field, revealing irregular spin-charge evolution and strong spin-dependent charge distributions.

Contribution

It provides a detailed analysis of driven quantum dynamics in a spin-orbit coupled double quantum dot, highlighting the transition between tunneling regimes under pulsed excitation.

Findings

Irregular evolution of spin and charge densities due to spin-orbit coupling

Strong spin dependence of charge density distribution

Clear transition from tunneling to strong coupling regime

Abstract

We consider the full driven quantum dynamics of a qubit realized as spin of electron in a one-dimensional double quantum dot with spin-orbit coupling. The driving perturbation is taken in the form of a single half-period pulse of electric field. Spin-orbit coupling leads to a nontrivial evolution in the spin and charge densities making the dynamics in both quantities irregular. As a result, the charge density distribution becomes strongly spin-dependent. The transition from the field-induced tunneling to the strong coupling regime is clearly seen in the charge and spin channels. These results can be important for the understanding of the techniques for the spin manipulation in nanostructures.