Nuclear spin relaxation probed by a single quantum dot

TL;DR

This study investigates nuclear spin relaxation in a single quantum dot, demonstrating control via electron spin resonance and gate voltage, with relaxation times around 10 minutes, advancing understanding of spin dynamics in quantum systems.

Contribution

It provides direct measurements of nuclear spin relaxation times in a quantum dot and shows control over spin transfer mechanisms using electron spin resonance and gate voltage.

Findings

Electron-nuclear relaxation times are about 10 minutes.

Spin transfer can be tuned via electron spin resonance.

Nuclear spin relaxation depends on the quantum dot gate voltage.

Abstract

We present measurements on nuclear spin relaxation probed by a single quantum dot in a high-mobility electron gas. Current passing through the dot leads to a spin transfer from the electronic to the nuclear spin system. Applying electron spin resonance the transfer mechanism can directly be tuned. Additionally, the dependence of nuclear spin relaxation on the dot gate voltage is observed. We find electron-nuclear relaxation times of the order of 10 minutes.