Theory of spin inertia in singly-charged quantum dots

TL;DR

This paper develops a comprehensive theoretical framework for spin inertia measurements in singly-charged quantum dots, enabling detailed analysis of spin dynamics and interactions through experimental data.

Contribution

It introduces a general theory of spin inertia in quantum dots, linking measurements to key spin parameters and interactions, expanding understanding of spin behavior in these systems.

Findings

Spin inertia measurement can determine spin relaxation times.

It allows extraction of g-factors and hyperfine interaction parameters.

The theory connects experimental signals to microscopic spin properties.

Abstract

The spin inertia measurement is a recently emerged tool to study slow spin dynamics, which is based on the excitation of the system by a train of circularly polarized pulses with alternating helicity. Motivated by the experimental results reported in E. A. Zhukov et al., arXiv:1806.11100 we develop the general theory of spin inertia of localized charge carriers. We demonstrate that the spin inertia measurement in longitudinal magnetic field allows one to determine the parameters of the spin dynamics of resident charge carriers and of photoexcited trions, such as the spin relaxation times, longitudinal g-factors, parameters of hyperfine interaction and nuclear spin correlation times.