Dynamics of excitons in CdSe nanoplatelets

TL;DR

This paper presents a theoretical framework for calculating optical properties of CdSe nanoplatelets, accounting for dielectric effects, geometry, and temperature, with results validated against experimental data.

Contribution

It provides analytical expressions for excitonic optical functions considering dielectric confinement and nanoplatelet geometry, including nonlinear and time-dependent effects.

Findings

Analytical formulas for absorption and exciton energies.

Impact of nanoplatelet geometry on optical spectra.

Temperature effects on nonlinear optical responses.

Abstract

We show how to calculate the linear and nonlinear optical functions of CdSe nanoplatelets, taking into account the effect of a dielectric confinement on excitonic states. We consider both stationary and non-stationary excitation regime. We obtain obtain analytical expressions for the absorption coefficient, the exciton resonance energy and binding energy of nanoplatelets. The impact of plate geometry (thickness, lateral dimension) on the spectrum is discussed. In the nonlinear case we analyze the impact of temperature. For the short-pulse excitation the time dependence of the spectra is considered. The results are compared with the available experimental data.