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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanophotonics

Background:

  • Heterostructures of quantum emitters and nanostructures offer tailored photoluminescence.
  • Photonic Rashba effect involves spin-split dispersion in momentum space.
  • Berry-phase defects in photonic crystals can induce geometric phase pickup.

Purpose of the Study:

  • To demonstrate a photonic Rashba effect from valley excitons in a WSe2 monolayer.
  • To investigate spin-dependent manipulation of quantum emitters using Berry-phase defective photonic crystals.
  • To explore applications in customized planar light sources with spin-polarized emission.

Main Methods:

  • Integration of a WSe2 monolayer into a Berry-phase defective photonic crystal slab.
  • Site-controlled excitation and photoluminescence measurements of valley excitons.
  • Demonstration of spin-state separation for quantum dot emission.

Main Results:

  • Observation of spin-split dispersion in momentum space due to the photonic Rashba effect.
  • Evidence of valley separation for excitons with opposite helicities at room temperature.
  • Successful separation of opposite spin states from quantum dot emission using the defective photonic crystal.

Conclusions:

  • Berry-phase defective photonic crystals enable effective spin-dependent manipulation of quantum emitters.
  • The demonstrated photonic Rashba effect provides a pathway for controlling light emission properties.
  • This approach holds promise for developing highly efficient metasurfaces for spin-polarized directional light sources.