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Area of Science:

  • Quantum physics and photonics.
  • Condensed matter systems.
  • Engineered photonic lattices.

Background:

  • Coupling of quantum or classical degrees of freedom is fundamental to many physical phenomena.
  • Exciton-polariton micropillars are key for topological lasers, reservoir computing, and quantum simulations.
  • Previous research primarily utilized positive coupling, limiting exploration of unique phenomena achievable with negative coupling.

Purpose of the Study:

  • To experimentally demonstrate negative coupling between exciton-polariton micropillars.
  • To construct a Su-Schrieffer-Heeger (SSH) topological lattice incorporating both positive and negative coupling.
  • To achieve polariton condensation in topological edge states at room temperature.

Main Methods:

  • Utilized an additional larger micropillar to induce negative coupling between two smaller micropillars.
  • Fabricated a hybrid topological lattice by combining positively and negatively coupled micropillars.
  • Employed non-resonant excitation to achieve polariton condensation.

Main Results:

  • Successfully demonstrated negative coupling in an exciton-polariton system.
  • Constructed an SSH topological lattice with a notable topological gap of ~15 meV.
  • Observed band inversion at the center of the Brillouin zone (BZ), deviating from conventional SSH lattices.
  • Achieved room-temperature polariton condensation in the in-gap topological edge states.

Conclusions:

  • Introduced a universal method for realizing negative coupling in polariton systems.
  • The developed technique enables the creation of novel polaritonic devices with tunable coupling signs.
  • This work expands the possibilities for designing advanced topological photonic systems.