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Area of Science:

  • Quantum optics and nanophotonics
  • Condensed matter physics
  • Materials science

Background:

  • Photonic bound states in the continuum (BICs) confine light for enhanced light-matter interactions.
  • Chiral BICs exhibit high circular polarization, promising for spin-selective applications.
  • Atomically-thin transition metal dichalcogenide crystals (TMDCs) host spin-polarized (valley) excitons.

Purpose of the Study:

  • To demonstrate a novel application of chiral BICs for strong coupling with valley excitons in TMDCs.
  • To investigate the formation and properties of chiral, valley-selective exciton polaritons.
  • To understand the energy relaxation dynamics and polarization control of these novel quasiparticles.

Main Methods:

  • Fabrication of a metasurface hosting chiral BICs.
  • Integration of monolayer WS2 onto the BIC metasurface.
  • Characterization using circularly polarized photoluminescence (PL).
  • Development of a microscopic model for theoretical analysis.

Main Results:

  • Observation of intrinsically chiral, valley-selective exciton polaritons.
  • PL intensity and circular polarization enhancement by an order of magnitude compared to uncoupled excitons.
  • Demonstration of a direct emission pathway for high-momentum polaritons via Brillouin zone folding.
  • Control over spin alignment of upper and lower polaritons via optical excitation polarization.

Conclusions:

  • Chiral BICs can induce strong coupling with valley excitons, forming new chiral light-matter quasiparticles.
  • The developed system offers enhanced light-matter interaction and spin-selective control.
  • Insights into energy relaxation dynamics and suppression of depolarization in polaritons were gained.