Tunneling induced spin dynamics in a quantum dot-lead hybrid system

TL;DR

This paper investigates how tunneling between a quantum dot and a lead influences spin dynamics, revealing relaxation mechanisms and higher order tunneling events, which could advance quantum spin control techniques.

Contribution

It provides new insights into charge and spin relaxation mechanisms in QD-lead hybrid systems through experimental analysis.

Findings

Charge and spin relaxation dynamics are interconnected.

Higher order tunneling events can be detected via spin signals.

Results suggest potential for controlled spin manipulation in hybrid systems.

Abstract

Semiconductor quantum dots (QDs) offer a platform to explore the physics of quantum electronics including spins. Electron spins in QDs are considered good candidates for quantum bits in quantum information processing, and spin control and readout have been established down to a single electron level. We use these techniques to explore spin dynamics in a hybrid system, namely a QD coupled to a two dimensional electronic reservoir. The proximity of the lead results in relaxation dynamics of both charge and spin, the mechanism of which is revealed by comparing the charge and spin signal. For example, higher order charge tunneling events can be monitored by observing the spin. We expect these results to stimulate further exploration of spin dynamics in QD-lead hybrid systems and expand the possibilities for controlled spin manipulations.