Publication Type : Journal Article
Source : ACS Applied Nano Materials
Url : https://pubs.acs.org/doi/10.1021/acsanm.0c00365
Campus : Bengaluru
School : School of Engineering
Year : 2020
Abstract : We utilized time-resolved photoluminescence (TRPL) spectroscopy to study the excitonic circular polarization (PX) from CdSe/CdMnS core/shell nanoplatelets (NPLs) with a bilayer core. This allows an extensive study of the emission dynamics as a function of magnetic field, temperature, doping concentration, and excitation wavelength. In the presence of an external magnetic field, pulsed excitation below the shell gap results in near-zero excitonic circular polarization PX at all time delays. In contrast, pulsed excitation with photon energy larger than the shell gap results in a rapid (100 ps) buildup of the excitonic circular polarization which subsequently remains constant at a level of up to 40%. We propose a model to describe the dynamics which takes into account the exchange interaction between carrier and magnetic ion (Mn) spins. The studied system exhibits a fast switchable excitonic circular polarization, implying possible applications in lasers and light emitting diodes.
Cite this Research Publication : Arman Najafi, Steven Tarasek, Savas Delikanli, Peiyao Zhang, Tenzin Norden, Sushant Shendre, Manoj Sharma, Arinjoy Bhattacharya, Nima Taghipour, James Pientka, Hilmi Volkan Demir, Athos Petrou, Tim Thomay , CdSe/CdMnS Nanoplatelets with Bilayer Core and Magnetically Doped Shell Exhibit Switchable Excitonic Circular Polarization: Implications for Lasers and Light-Emitting Diodes, ACS Applied Nano Materials, 2020