Angular harmonics of the excitonic polarization conversions effect

TL;DR

This paper develops a phenomenological theory for excitonic polarization conversion effects in quantum dots, classifying responses via nine coefficients and predicting two effects yet to be experimentally observed.

Contribution

It introduces a comprehensive classification scheme for polarization conversions based on angular harmonics and predicts new effects in excitonic systems.

Findings

All polarization responses are described by nine field-dependent coefficients.

Existing experimental data fit well within the proposed classification.

Two novel effects are predicted for future experimental verification.

Abstract

We suggest a phenomenological theory of the polarization conversions effect, an excitonic analog of the first-order spatial dispersion phenomena which is, however, observed in the photoluminescence rather than in the passing light. The optical polarization response of a model system of electrically neutral quantum dots subject to the magnetic field along the growth axis was calculated by means of the pseudospin method. All possible forms of the polarization response are determined by nine different field-dependent coefficients which represent, therefore, a natural basis for classification of a variety of conversions. Existing experimental data can be well inscribed in this classification scheme. Predictions were made regarding two effects which have not been addressed experimentally.