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Title: sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
Authors: Muckel, Franziska
Delikanli, Savas
Hernández-Martínez, Pedro Ludwig
Priesner, Tamara
Lorenz, Severin
Ackermann, Julia
Sharma, Manoj
Demir, Hilmi Volkan
Bacher, Gerd
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2018
Source: Muckel, F., Delikanli, S., Hernandez-Martínez, P. L., Presner, T., Lorenz, S., Ackermann, J., . . . Bacher, Gerd. (2018). sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets. Nano Letters, 18(3), 2047–2053. doi:10.1021/acs.nanolett.8b00060
Project: NRF-NRFI2016-08
Journal: Nano Letters
Abstract: In two-dimensional (2D) colloidal semiconductor nanoplatelets, which are atomically flat nanocrystals, the precise control of thickness and composition on the atomic scale allows for the synthesis of heterostructures with well-defined electron and hole wave function distributions. Introducing transition metal dopants with a monolayer precision enables tailored magnetic exchange interactions between dopants and band states. Here, we use the absorption based technique of magnetic circular dichroism (MCD) to directly prove the exchange coupling of magnetic dopants with the band charge carriers in hetero-nanoplatelets with CdSe core and manganese-doped CdS shell (CdSe/Mn:CdS). We show that the strength of both the electron as well as the hole exchange interactions with the dopants can be tuned by varying the nanoplatelets architecture with monolayer accuracy. As MCD is highly sensitive for excitonic resonances, excited level spectroscopy allows us to resolve and identify, in combination with wave function calculations, several excited state transitions including spin-orbit split-off excitonic contributions. Thus, our study not only demonstrates the possibility to expand the extraordinary physical properties of colloidal nanoplatelets toward magneto-optical functionality by transition metal doping but also provides an insight into the excited state electronic structure in this novel two-dimensional material.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.8b00060
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Organisations: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
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