Nonlinear optical response of hole-trion systems in quantum dots in tilted magnetic fields

TL;DR

This paper provides a theoretical analysis of four wave mixing spectroscopy on p-doped quantum dots in tilted magnetic fields, revealing complementary insights into spin dynamics compared to Kerr rotation spectroscopy.

Contribution

It introduces analytical formulas for the system's nonlinear optical response in tilted magnetic fields, extending understanding of spin dynamics in quantum dots.

Findings

Kerr rotation and four wave mixing spectra provide complementary information.

Analytical formulas describe the system's response under ultrafast optical driving.

The study compares theoretical predictions with previous Kerr rotation results.

Abstract

We discuss, from a theoretical point of view, the four wave mixing spectroscopy on an ensemble of p-doped quantum dots in a magnetic field slightly tilted from the in-plane configuration. We describe the system evolution in the density matrix formalism. In the limit of coherent ultrafast optical driving, we obtain analytical formulas for the single system dynamics and for the response of an inhomogeneously broadened ensemble. The results are compared to the previously studied time-resolved Kerr rotation spectroscopy on the same system. We show that the Kerr rotation and four wave mixing spectra yield complementary information on the spin dynamics (precession and damping).