Switchable Excitonic Circular Polarization in CdSe/CdMnS Nanoplatelets with Bilayer Core and Magnetically Doped Shell

ORAL

Abstract

We have utilized time-resolved photoluminescence (TRPL) to study the excitonic circular polarization from CdSe/CdMnS core/shell nanoplatelets (NPLs) with a bilayer core. This technique allows detailed 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 circular polarization at all times. In contrast, pulsed excitation with a photon energy larger than the shell gap results in a rapid (100 ps) build-up of the excitonic circular polarization which subsequently remains constant at a level of up to 40%.
We explore a model that describes these results; we also discuss possible applications.

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Presenters

  • Arman Najafi

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York
    • Physics, State Univ of NY - Buffalo, Buffalo, New York

Authors

  • Arman Najafi

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York
    • Physics, State Univ of NY - Buffalo, Buffalo, New York

  • Steven Tarasek

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York

  • Savas Delikanli

    • Department of Electrical and Electronics Engineering, Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey

  • Peiyao Zhang

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York

  • Tenzin Norden

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York

  • Sushant Shendre

    • LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

  • Manoj Sharma

    • LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

  • Arinjoy Bhattacharya

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York
    • Physics, State Univ of NY - Buffalo, Buffalo, New York

  • Nima Taghipour

    • Department of Electrical and Electronics Engineering, Department of Physics, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, Turkey

  • James Pientka

    • Department of Physics, St. Bonaventure University, St. Bonaventure, New York
    • St Bonaventure Univ

  • Hilmi Volkan Demir

    • LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, Singapore

  • Athos Petrou

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York
    • Physics, State Univ of NY - Buffalo, Buffalo, New York

  • Tim Thomay

    • Department of Physics, State University of New York at Buffalo, Buffalo, New York