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
Department of Physics, University at Buffalo SUNY, Buffalo, New York 14260, United States.
Luminous! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798.
J Phys Chem Lett. 2021 Mar 25;12(11):2892-2899. doi: 10.1021/acs.jpclett.1c00398. Epub 2021 Mar 16.
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 () and the exciton Zeeman splitting () were recorded as a function of the magnetic field () and temperature (). Both and have a Brillouin-function-like dependence on and , 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 Ag, 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.
我们描述了一项关于采用新型掺杂技术生长的掺银CdSe胶体纳米片（NPLs）磁光性质的研究。在这项工作中，我们首次使用磁圆偏振发光和磁圆二色光谱来研究二维溶液处理结构中掺杂名义上非磁性的银杂质时的光致磁性。记录了激子圆偏振（）和激子塞曼分裂（）作为磁场（）和温度（）的函数。和都对和呈现出类似布里渊函数的依赖关系，证实了掺银CdSe纳米片中顺磁性的存在。观察到的光致磁性归因于非磁性银离子转变为具有非零磁矩的银。这项工作指出了将这些纳米片纳入自旋电子器件的可能性，其中光可用于控制自旋注入。
