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Two-Dimensional Topological Polariton Laser.

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We demonstrate lasing in a 2D polariton topological insulator by selectively amplifying edge states. This work paves the way for novel topological lasers with enhanced stability and unique optical properties.

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Area of Science:

  • Condensed matter physics
  • Quantum optics
  • Photonics

Background:

  • Topological insulators protect edge states from scattering.
  • Polariton systems offer unique light-matter interactions.
  • Lasing requires overcoming losses to achieve gain.

Purpose of the Study:

  • To demonstrate lasing in a 2D polariton topological insulator.
  • To investigate the role of gain in topological edge states.
  • To explore nonlinear edge states and topological currents.

Main Methods:

  • Utilizing a structured polariton microcavity.
  • Applying spin-orbit coupling and Zeeman splitting.
  • Concentrating gain along the insulator edge.

Main Results:

  • Achieved lasing by amplifying topological edge states while damping bulk modes.
  • Formed metastable nonlinear edge states via gain and nonlinear absorption.
  • Observed persistent topological currents and density oscillations in a triangular structure.

Conclusions:

  • Selective gain can overcome losses in topological edge states, enabling lasing.
  • Nonlinear effects lead to robust edge states and persistent currents.
  • This work presents a new platform for topological photonics and lasers.