Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets

We describe a study of the magneto-optical properties of Ag+-doped CdSe colloidal nanoplatelets (NPLs) that were grown using a novel doping technique. In this work, we used magnetic circularly polarized luminescence and magnetic circular dichroism spectroscopy to study light-induced magnetism for th...

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Main Authors: Najafi, Arman, Sharma, Manoj, Delikanli, Savas, Bhattacharya, Arinjoy, Murphy, Joseph R., Pientka, James, Sharma, Ashma, Quinn, Alexander P., Erdem, Onur, Kattel, Subash, Kelestemur, Yusuf, Kovalenko, Maksym V., Rice, William D., Demir, Hilmi Volkan, Petrou, Athos
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/147028
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1470282021-03-31T01:42:30Z Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets Najafi, Arman Sharma, Manoj Delikanli, Savas Bhattacharya, Arinjoy Murphy, Joseph R. Pientka, James Sharma, Ashma Quinn, Alexander P. Erdem, Onur Kattel, Subash Kelestemur, Yusuf Kovalenko, Maksym V. Rice, William D. Demir, Hilmi Volkan Petrou, Athos School of Electrical and Electronic Engineering School of Physical and Mathematical Sciences LUMINOUS! Centre of Excellence for Semiconductor Lighting & Displays Engineering::Materials CdSe Nanoplatelets Light-induced Magnetism We describe a study of the magneto-optical properties of Ag+-doped CdSe colloidal nanoplatelets (NPLs) that were grown using a novel doping technique. In this work, we used magnetic circularly polarized luminescence and magnetic circular dichroism spectroscopy to study light-induced magnetism for the first time in 2D solution-processed structures doped with nominally nonmagnetic Ag+ impurities. The excitonic circular polarization (PX) and the exciton Zeeman splitting (ΔEZ) were recorded as a function of the magnetic field (B) and temperature (T). Both ΔEZ and PX have a Brillouin-function-like dependence on B and T, verifying the presence of paramagnetism in Ag+-doped CdSe NPLs. The observed light-induced magnetism is attributed to the transformation of nonmagnetic Ag+ ions into Ag2+, which have a nonzero magnetic moment. This work points to the possibility of incorporating these nanoplatelets into spintronic devices, in which light can be used to control the spin injection. Agency for Science, Technology and Research (A*STAR) National Research Foundation (NRF) Accepted version A.P. acknowledge support from the NSF MRI Award 1726303. M.S and H.V.D would like to acknowledge the financial support from Singapore National Research Foundation under the Program of NRF-NRFI2016-08, NRF-CRP14-2014-03, and the Science and Engineering Research Council, Agency for Science, Technology, and Research (A*STAR) of Singapore. H.V.D is also grateful to acknowledge additional financial support from the TUBA. M.K and Y.K. acknowledge financial support from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant No. 798697. We acknowledge the support of the Scientific Center for Optical and Electron Microscopy (ScopeM) of the Swiss Federal Institute of Technology ETHZ. 2021-03-31T01:42:30Z 2021-03-31T01:42:30Z 2021 Journal Article Najafi, A., Sharma, M., Delikanli, S., Bhattacharya, A., Murphy, J. R., Pientka, J., Sharma, A., Quinn, A. P., Erdem, O., Kattel, S., Kelestemur, Y., Kovalenko, M. V., Rice, W. D., Demir, H. V. & Petrou, A. (2021). Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets. Journal of Physical Chemistry Letters, 12(11), 2892-2899. https://dx.doi.org/10.1021/acs.jpclett.1c00398 1948-7185 https://hdl.handle.net/10356/147028 10.1021/acs.jpclett.1c00398 33724845 11 12 2892 2899 en Journal of Physical Chemistry Letters This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry 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.jpclett.1c00398 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::Materials
CdSe Nanoplatelets
Light-induced Magnetism
spellingShingle Engineering::Materials
CdSe Nanoplatelets
Light-induced Magnetism
Najafi, Arman
Sharma, Manoj
Delikanli, Savas
Bhattacharya, Arinjoy
Murphy, Joseph R.
Pientka, James
Sharma, Ashma
Quinn, Alexander P.
Erdem, Onur
Kattel, Subash
Kelestemur, Yusuf
Kovalenko, Maksym V.
Rice, William D.
Demir, Hilmi Volkan
Petrou, Athos
Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
description We describe a study of the magneto-optical properties of Ag+-doped CdSe colloidal nanoplatelets (NPLs) that were grown using a novel doping technique. In this work, we used magnetic circularly polarized luminescence and magnetic circular dichroism spectroscopy to study light-induced magnetism for the first time in 2D solution-processed structures doped with nominally nonmagnetic Ag+ impurities. The excitonic circular polarization (PX) and the exciton Zeeman splitting (ΔEZ) were recorded as a function of the magnetic field (B) and temperature (T). Both ΔEZ and PX have a Brillouin-function-like dependence on B and T, verifying the presence of paramagnetism in Ag+-doped CdSe NPLs. The observed light-induced magnetism is attributed to the transformation of nonmagnetic Ag+ ions into Ag2+, which have a nonzero magnetic moment. This work points to the possibility of incorporating these nanoplatelets into spintronic devices, in which light can be used to control the spin injection.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Najafi, Arman
Sharma, Manoj
Delikanli, Savas
Bhattacharya, Arinjoy
Murphy, Joseph R.
Pientka, James
Sharma, Ashma
Quinn, Alexander P.
Erdem, Onur
Kattel, Subash
Kelestemur, Yusuf
Kovalenko, Maksym V.
Rice, William D.
Demir, Hilmi Volkan
Petrou, Athos
format Article
author Najafi, Arman
Sharma, Manoj
Delikanli, Savas
Bhattacharya, Arinjoy
Murphy, Joseph R.
Pientka, James
Sharma, Ashma
Quinn, Alexander P.
Erdem, Onur
Kattel, Subash
Kelestemur, Yusuf
Kovalenko, Maksym V.
Rice, William D.
Demir, Hilmi Volkan
Petrou, Athos
author_sort Najafi, Arman
title Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
title_short Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
title_full Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
title_fullStr Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
title_full_unstemmed Light-induced paramagnetism in colloidal Ag+-doped CdSe nanoplatelets
title_sort light-induced paramagnetism in colloidal ag+-doped cdse nanoplatelets
publishDate 2021
url https://hdl.handle.net/10356/147028
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