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Area of Science:

  • Topological physics
  • Condensed matter physics
  • Photonics

Background:

  • Topological lasers offer robust coherent light emission against defects due to nontrivial band topology.
  • Exciton polariton topological lasers promise low-power consumption without population inversion, leveraging their bosonic nature.

Purpose of the Study:

  • To experimentally realize higher-order topological corner states in exciton polaritons.
  • To achieve lasing from these topological corner states in perovskite polaritons.

Main Methods:

  • Utilized an extended two-dimensional Su-Schrieffer-Heeger lattice model.
  • Experimentally demonstrated topological corner states in perovskite polaritons.

Main Results:

  • Achieved polariton corner state lasing at room temperature.
  • Demonstrated a low lasing threshold (approximately μJ/cm²).
  • Showcased topological protection for polariton localization.

Conclusions:

  • First experimental realization of topological corner states in exciton polaritons.
  • Paves the way for on-chip active polaritonics utilizing higher-order topology.
  • Highlights a novel mechanism for topologically protected polariton localization.