Precise measurements of electron and hole g-factors of single quantum dots by using nuclear field

TL;DR

This paper presents a method to precisely measure electron and hole g-factors in single quantum dots by using nuclear field effects to cancel external magnetic fields, enabling accurate characterization of their magnetic properties.

Contribution

The study introduces a novel technique leveraging nuclear field-induced cancellation to accurately determine electron and hole g-factors in single quantum dots.

Findings

Precise values of electron and hole g-factors obtained.

Method allows determination of g-factor sign and magnitude.

Nuclear field cancellation enhances measurement accuracy.

Abstract

We demonstrated the cancellation of the external magnetic field by the nuclear field at one edge of the nuclear polarization bistability in single InAlAs quantum dots. The cancellation for the electron Zeeman splitting gives the precise value of the hole g-factor. By combining with the exciton g-factor that is obtained from the Zeeman splitting for linearly polarized excitation, the magnitude and sign of the electron and hole g-factors in the growth direction are evaluated.