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Area of Science:

  • Condensed matter physics
  • Topological photonics
  • Non-Hermitian systems

Background:

  • Topological insulators exhibit unique edge states protected by topology.
  • Active photonic systems offer novel functionalities beyond passive counterparts.
  • Non-Hermiticity introduces unique phenomena like exceptional points and phase transitions.

Purpose of the Study:

  • To experimentally observe lasing topological edge states in a 1D Su-Schrieffer-Heeger active array.
  • To investigate the role of non-Hermiticity in achieving single edge-mode lasing.
  • To explore phase transitions in non-Hermitian topological structures driven by geometric phase.

Main Methods:

  • Fabrication and characterization of a 1D Su-Schrieffer-Heeger array of microring resonators.
  • Implementation of non-Hermiticity through engineered gain.
  • Theoretical modeling incorporating non-Hermiticity, chiral-time symmetry, and geometric phase.
  • Experimental observation of lasing phenomena and edge-mode behavior.

Main Results:

  • First experimental observation of lasing topological edge states in the specified array.
  • Demonstration that non-Hermiticity can induce and control single edge-mode lasing.
  • Observation of topological phase transitions dictated by a complex geometric phase under chiral-time symmetry.
  • Confirmation of interplay between non-Hermiticity, nonlinearity, and topology in active systems.

Conclusions:

  • Lasing topological edge states are achievable in 1D active photonic arrays.
  • Non-Hermiticity is a crucial tool for controlling topological states and achieving single-mode lasing.
  • Complex geometric phase governs phase transitions in these non-Hermitian topological systems.
  • This research opens avenues for exploring fundamental physics at the nexus of non-Hermiticity, nonlinearity, and topology in active systems.