Resistive detection of nuclear spins in a single quantum dot under Kondo effect regime

TL;DR

This paper investigates how nuclear spins in a semiconductor quantum dot can be detected through resistive measurements under the Kondo effect, revealing hysteresis in conductance spectra linked to dynamic nuclear polarization.

Contribution

It demonstrates resistive detection of nuclear spins via dynamic nuclear polarization in a quantum dot under the Kondo regime, a novel approach for nuclear spin measurement.

Findings

Hysteresis observed in differential conductance spectra under the Kondo effect.

Nuclear magnetic resonance signals detected through conductance monitoring.

Nuclear spin relaxation rates measured in the quantum dot.

Abstract

We study dynamic polarization and resistive detection of nuclear spins in a semiconductor quantum dot (QD) under the Kondo effect regime. We find that the differential conductance spectra of the QD exhibit hysteresis under the Kondo effect regime in magnetic fields. Relevance of nuclear spins to the hysteresis is confirmed by the detection of nuclear magnetic resonance signals by monitoring the differential conductance. We attribute the origin of the hysteresis to the dynamic nuclear spin polarization (DNP) induced in the QD. Using the DNP, we demonstrate nuclear spin relaxation rate measurements in the QD under the Kondo effect regime.