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Researchers observed a cross Feshbach resonance in semiconductor microcavities, identifying a biexciton bound state as the cause of polariton scattering. This finding is key to enhancing entangled photon pair generation.

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Area of Science:

  • Quantum optics
  • Solid-state physics
  • Semiconductor microcavities

Background:

  • Polaritons are quasiparticles formed from the interaction of light and matter.
  • Feshbach resonances are crucial for controlling interactions between quantum particles.
  • Semiconductor microcavities confine light-matter interactions.

Purpose of the Study:

  • To demonstrate and characterize cross Feshbach resonance in a semiconductor microcavity.
  • To identify the underlying scattering mechanism responsible for the resonance.
  • To establish conditions for enhanced entangled photon pair generation.

Main Methods:

  • Strongly driving a lower polariton mode.
  • Monitoring the transmission of a short optical pulse at the upper polariton mode energy.
  • Analyzing optical resonance signatures, energy shifts, and scattering strengths.

Main Results:

  • Experimental evidence for cross Feshbach resonance was demonstrated.
  • The scattering process between polariton modes of opposite circular polarization was attributed to a biexciton bound state.
  • The strength and sign of the energy shift provided signatures of the resonance.

Conclusions:

  • The study confirms the existence of cross Feshbach resonance in semiconductor microcavities.
  • A biexciton bound state is identified as the origin of polariton scattering.
  • Conditions for significantly enhancing entangled photon pair generation were inferred.