Observation of the quantized motion of excitons in CdSe nanoplatelets

Journal article (2020)

Authors

Michele Failla ChemE/Opto-electronic Materials - AS
M. Failla ChemE/Opto-electronic Materials - AS
Francisco García Flórez Universiteit Utrecht
Bastiaan B.V. Salzmann Universiteit Utrecht
Daniel Vanmaekelbergh Universiteit Utrecht
Henk T.C. Stoof Universiteit Utrecht
L.D.A. Siebbeles ChemE/Opto-electronic Materials - AS
Research Group
ChemE/Opto-electronic Materials (AS) (TU Delft)
Copyright: © 2020 M. Failla, Francisco García Flórez, Bastiaan B.V. Salzmann, Daniel Vanmaekelbergh, Henk T.C. Stoof, L.D.A. Siebbeles
DOI: https://doi.org/10.1103/PhysRevB.102.195405
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Published Date

2020

Language

English

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Faculty

Applied Sciences

Department

ChemE/Chemical Engineering

Research Group

ChemE/Opto-electronic Materials

Abstract

We show that the finite lateral sizes of ultrathin CdSe nanoplatelets strongly affect both their photoluminescence and optical absorption spectra. This is in contrast to the situation in quantum wells, in which the large lateral sizes may be assumed to be infinite. The lateral sizes of the nanoplatelets are varied over a range of a few to tens of nanometers. For these sizes excitons experience in-plane quantum confinement, and their center-of-mass motion becomes quantized. Our direct experimental observation of the discretization of the exciton center-of-mass states can be well understood on the basis of the simple particle-in-a-box model.

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