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In semiconductor microcavities, a 2D geometry enables a first-order dissipative phase transition, unlike 1D. This research explores polariton physics in tunable optical systems.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Nonlinear Optics

Background:

  • Investigating phase transitions in driven open quantum systems is crucial for understanding complex many-body phenomena.
  • Semiconductor microcavities in the strong light-matter coupling regime host exotic quasiparticles called polaritons.
  • Controlling system dimensionality is key to observing and manipulating quantum phase transitions.

Purpose of the Study:

  • To theoretically and experimentally investigate first-order dissipative phase transitions in a tunable semiconductor microcavity system.
  • To explore the role of spatial dimensionality (1D vs. 2D) in the emergence of criticality.
  • To demonstrate an all-optical method for controlling system geometry and studying photon many-body physics.

Main Methods:

  • Utilizing a planar semiconductor microcavity in the strong light-matter coupling regime.
  • Injecting polariton excitations via a quasiresonant optical driving field with tunable spatial profiles (1D to 2D).
  • Analyzing system nonlinearity from polariton-polariton interactions and diffusive boundary conditions.

Main Results:

  • No phase transition was observed in the 1D driving geometry.
  • A first-order dissipative phase transition was confirmed both theoretically and experimentally in the 2D geometry.
  • The study demonstrates in-situ, all-optical control over the system's geometric properties.

Conclusions:

  • The spatial dimension critically influences the occurrence of dissipative phase transitions in polaritonic systems.
  • 2D geometries in semiconductor microcavities provide a viable platform for observing and controlling first-order phase transitions.
  • This work offers a versatile approach for exploring the many-body physics of photons in tunable optical systems.