sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets

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 transi...

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Main Authors: Muckel, Franziska, Delikanli, Savas, Hernández-Martínez, Pedro Ludwig, Priesner, Tamara, Lorenz, Severin, Ackermann, Julia, Sharma, Manoj, Demir, Hilmi Volkan, Bacher, Gerd
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143490
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spelling sg-ntu-dr.10356-1434902023-02-28T19:49:41Z sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets Muckel, Franziska Delikanli, Savas Hernández-Martínez, Pedro Ludwig Priesner, Tamara Lorenz, Severin Ackermann, Julia Sharma, Manoj Demir, Hilmi Volkan Bacher, Gerd School of Electrical and Electronic Engineering School of Materials Science and Engineering School of Physical and Mathematical Sciences LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays Engineering::Electrical and electronic engineering Colloidal Nanoplatelets Semiconductor Nanocrystals 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. National Research Foundation (NRF) Accepted version This research is supported by the German Research Foundation DFG under contract BA-1422 and the National Research Foundation, Prime Minister’s Office, Singapore under its Investigatorship program (NRF-NRFI2016-08). H.V.D. gratefully acknowledges TUBA. 2020-09-04T06:40:38Z 2020-09-04T06:40:38Z 2018 Journal Article 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 1530-6984 https://hdl.handle.net/10356/143490 10.1021/acs.nanolett.8b00060 29464958 2-s2.0-85044002556 3 18 2047 2053 en NRF-NRFI2016-08 Nano Letters 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 https://doi.org/10.1021/acs.nanolett.8b00060 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Colloidal Nanoplatelets
Semiconductor Nanocrystals
spellingShingle Engineering::Electrical and electronic engineering
Colloidal Nanoplatelets
Semiconductor Nanocrystals
Muckel, Franziska
Delikanli, Savas
Hernández-Martínez, Pedro Ludwig
Priesner, Tamara
Lorenz, Severin
Ackermann, Julia
Sharma, Manoj
Demir, Hilmi Volkan
Bacher, Gerd
sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
description 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.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Muckel, Franziska
Delikanli, Savas
Hernández-Martínez, Pedro Ludwig
Priesner, Tamara
Lorenz, Severin
Ackermann, Julia
Sharma, Manoj
Demir, Hilmi Volkan
Bacher, Gerd
format Article
author Muckel, Franziska
Delikanli, Savas
Hernández-Martínez, Pedro Ludwig
Priesner, Tamara
Lorenz, Severin
Ackermann, Julia
Sharma, Manoj
Demir, Hilmi Volkan
Bacher, Gerd
author_sort Muckel, Franziska
title sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
title_short sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
title_full sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
title_fullStr sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
title_full_unstemmed sp-d Exchange interactions in wave function engineered colloidal CdSe/Mn:CdS hetero-nanoplatelets
title_sort sp-d exchange interactions in wave function engineered colloidal cdse/mn:cds hetero-nanoplatelets
publishDate 2020
url https://hdl.handle.net/10356/143490
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