Excitons in Cu2O -- from Quantum Wells to Bulk Crystals and Additional Boundary Conditions for Rydberg Exciton-Polaritons

TL;DR

This paper develops a comprehensive theoretical framework for calculating optical properties of Rydberg excitons in semiconductors across various dimensions, successfully matching experimental spectra.

Contribution

It introduces a unified scheme for modeling Rydberg excitons from quantum wells to bulk crystals, including polariton effects and boundary conditions.

Findings

Theoretical absorption spectra align well with experimental data.

The model covers a wide range of semiconductor geometries.

Discussion of multiple polariton branches enhances understanding of exciton-polariton interactions.

Abstract

We propose a scheme for calculation of optical functions of a semiconductor with Rydberg excitons, for a wide interval of dimensions. We start with 2-dimensional structure, then going to thin films and ending on 3-dimensional bulk crystals. The calculations including the polaritons are performed, the case of large number of polariton branches is discussed and obtained theoretical absorption spectra show good agreement with experimental data.