# Nanoplatelets as material system between strong confinement and weak confinement

## TL;DR

This paper investigates the electronic properties of CdSe nanoplatelets, revealing they exhibit a range of confinement regimes from strong to Coulomb dominated, and provides numerical solutions and comparisons to existing quantum well and quantum dot theories.

## Contribution

It demonstrates that nanoplatelets are not ideal quantum wells but span multiple confinement regimes, offering a versatile platform for studying quantum physics.

## Key findings

- Nanoplatelets exhibit strong, intermediate, and Coulomb confinement regimes.
- Numerical solutions of the four-dimensional Schrödinger equation are provided.
- Comparison with quantum well and quantum dot theories enhances understanding.

## Abstract

Recently, the fabrication of CdSe nanoplatelets became an important research topic. Nanoplatelets are often described as having a similar electronic structure as 2D dimensional quantum wells and are promoted as colloidal quantum wells with monolayer precision width. In this paper, we show, that nanoplatelets are not ideal quantum wells, but cover depending on the size: the strong confinement regime, an intermediate regime and a Coulomb dominated regime. Thus, nanoplatelets are an ideal platform to study the physics in these regimes. Therefore, the exciton states of the nanoplatelets are numerically calculated by solving the full four dimensional Schr\"odinger equation. We compare the results with approximate solutions from semiconductor quantum well and quantum dot theory. The paper can also act as review of these concepts for the colloidal nanoparticle community.