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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Propagating wave packets and quantized currents in coherently driven polariton superfluids.

M H Szymańska1, F M Marchetti, D Sanvitto

  • 1Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.

Physical Review Letters
|January 15, 2011
PubMed
Summary

Doubly charged vortices in polariton wave packets are stable only at low velocities due to nonquadratic dispersion. Higher velocities or direct imprinting lead to vortex instability and splitting.

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Area of Science:

  • Quantum optics
  • Condensed matter physics

Background:

  • Polaritons are quasiparticles formed from the coupling of photons and excitons.
  • Vortices are topological defects in wave phenomena, including polariton condensates.
  • The stability of these vortices is crucial for understanding their behavior and potential applications.

Purpose of the Study:

  • To investigate the stability of doubly charged vortices in propagating polariton wave packets.
  • To explore the relationship between wave packet velocity and vortex stability.
  • To understand the impact of excitation regimes on polariton dynamics and vortex behavior.

Main Methods:

  • Studying the propagation dynamics of polariton wave packets.
  • Analyzing photoluminescence spectra under different excitation conditions.
  • Observing the behavior of doubly charged vortices initiated at various velocities.

Main Results:

  • Polariton wave packet propagation shows complex behavior influenced by the excitation regime.
  • Doubly charged vortices are stable only when initiated in wave packets with small propagation velocities.
  • Vortices propagating at higher velocities or directly imprinted become unstable and split.

Conclusions:

  • Nonquadratic polariton dispersion is key to the velocity-dependent stability of doubly charged vortices.
  • Controlling wave packet velocity is essential for maintaining vortex integrity.
  • Directly imprinting vortices can lead to their rapid decay, limiting their practical use.