Optical properties of excitons in CdSe nanoplatelets and disks: real density matrix approach

TL;DR

This paper develops a theoretical framework using the real density matrix approach to analyze how dielectric confinement influences the optical properties of excitons in CdSe nanoplatelets and disks, providing analytical relations and comparisons with experiments.

Contribution

It introduces a semi-analytical method to calculate optical functions considering dielectric effects in nanoplatelets and nanodisks, advancing understanding of their excitonic behavior.

Findings

Analytical expressions for absorption coefficient and exciton energies.

Impact of geometry on optical spectra.

Agreement with experimental data.

Abstract

We show how to calculate the optical functions of a nanoplatelet, taking into account the effect of a dielectric confinement on excitonic states. Real density matrix approach is employed to obtain analytical and semi-analytical relations for the absorption coefficient, the exciton resonance energy and binding energy of nanoplatelets and nanodisks. The impact of plate geometry (thickness, area) on the spectrum is discussed and the results are compared with the available experimental data.