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
Keleştemur, Yusuf
Kovalenko, Maksym
Rice, William D.
Demir, Hilmi Volkan
Petrou, Athos
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 (P-X) and the exciton Zeeman splitting (Delta E-Z) were recorded as a function of the magnetic field (B) and temperature (T). Both Delta E-Z and P-X 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.


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Citation Formats
A. Najafi et al., “Light-Induced Paramagnetism in Colloidal Ag+-Doped CdSe Nanoplatelets,” JOURNAL OF PHYSICAL CHEMISTRY LETTERS, vol. 12, no. 11, pp. 2892–2899, 2021, Accessed: 00, 2021. [Online]. Available: