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Spin switchable optical phenomena in Rashba band structures through intersystem crossing in momentum space in solution-processing 2D-superlattice perovskite film

Author

Listed:
  • Bogdan Dryzhakov

    (University of Tennessee)

  • Yipeng Tang

    (University of Tennessee)

  • Jong Keum

    (Oak Ridge National Laboratory
    Center for Nanophase Materials Sciences)

  • Haile Ambaye

    (Oak Ridge National Laboratory)

  • Jinwoo Kim

    (Seoul National University)

  • Tae-Woo Lee

    (Seoul National University)

  • Valeria Lauter

    (Oak Ridge National Laboratory)

  • Bin Hu

    (University of Tennessee)

Abstract

Spin-switchable phenomena are a critical element for the development of spintronic and chiroptic devices. Herein we combine a 2D-superlattice perovskite (4,4-DFPD2PbI4) film with a ferromagnetic cobalt (Co) layer to form a multiferroic perovskite/Co interface, and demonstrate spin-switchable circularly polarized luminescence (CPL) between right-handed σ+ and left-handed σ− polarizations. When the ferromagnetic spins of Co at the Co/perovskite interface are altered between positive and negative magnetic field directions, the CPL from the 2D-superlattice perovskite switches from σ+ to σ− polarization. The magnetic field effects present a unique method to confirm that CPL is generated by the circular-orbital momentum of light-emitting excitons within Rashba band structures, eliminating artifacts involving structural birefringence. Our polarized neutron reflectometry measurements confirm a super long-range spin-orbit interaction occurring in the 2D-superlattice perovskite films. The temperature dependence of spin-switchable phenomenon indicates an extraordinarily long orbital polarization lifetime, reaching microseconds at room temperature and milliseconds at 5 K.

Suggested Citation

  • Bogdan Dryzhakov & Yipeng Tang & Jong Keum & Haile Ambaye & Jinwoo Kim & Tae-Woo Lee & Valeria Lauter & Bin Hu, 2025. "Spin switchable optical phenomena in Rashba band structures through intersystem crossing in momentum space in solution-processing 2D-superlattice perovskite film," Nature Communications, Nature, vol. 16(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57834-2
    DOI: 10.1038/s41467-025-57834-2
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