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Spin Injection and Emission Helicity Switching in a 2D Perovskite/WSe2 Heterostructure.

Jakub Jasiński1,2,3,4, Francesco Gucci5, Thomas Brumme6

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Researchers demonstrate tunable spin polarization in lead halide perovskite/WSe2 heterostructures. This breakthrough enables control over spin populations, paving the way for advanced opto-spintronics applications.

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2D perovskite-transition metal dichalcogenide heterostructurescharge transferinterlayer excitonspin polarization

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Optics

Background:

  • Controlling spin populations in lead halide perovskites is crucial for spintronics.
  • Interlayer excitons in (BA)2PbI4/WSe2 heterostructures offer potential for spin manipulation.

Purpose of the Study:

  • To investigate the circular dichroism of interlayer excitons in (BA)2PbI4/WSe2.
  • To understand the role of hybridized states in spin polarization control.
  • To explore the potential for 2D perovskites in opto-spintronics.

Main Methods:

  • Photoluminescence spectroscopy to observe interlayer excitons.
  • Circular dichroism measurements to analyze spin polarization.
  • Equilibrium and transient absorption spectroscopy to identify hybrid states.

Main Results:

  • Interlayer excitons exhibit excitation-energy-tunable circular dichroism.
  • A hybrid absorptive feature arises from hybridized valence band states.
  • The WSe2 monolayer acts as a tunable spin filter, controlling emission helicity.

Conclusions:

  • Tunable spin polarization in 2D perovskite heterostructures is achievable.
  • Hybridized states are key to controlling spin polarization.
  • This work advances the development of 2D perovskites for opto-spintronics.