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Nonequilibrium Prethermal States in a Two-Dimensional Photon Fluid.

Murad Abuzarli1, Nicolas Cherroret1, Tom Bienaimé1,2

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Non-equilibrium statistical mechanics

Background:

  • Superfluidity and phase transitions are fundamental concepts in condensed matter physics.
  • Understanding non-equilibrium systems is crucial for exploring exotic quantum states.
  • The Kosterlitz-Thouless transition describes a unique phase transition in 2D systems.

Purpose of the Study:

  • To investigate the existence and properties of a prethermal state in a two-dimensional fluid of light.
  • To study the dynamical emergence of correlations in a non-equilibrium system.
  • To explore the relationship between prethermal states and the Kosterlitz-Thouless transition.

Main Methods:

  • Direct measurement of the first-order coherence function.
  • Creation and manipulation of a two-dimensional fluid of light.
  • Controlled variation of system fluctuations.

Main Results:

  • Observation of a prethermal quasi-steady-state in the light fluid.
  • Dynamical emergence of algebraic correlations, mimicking thermal superfluids.
  • Crossover from algebraic to short-range correlations with increased fluctuations.

Conclusions:

  • The observed prethermal state serves as a non-equilibrium precursor to the Kosterlitz-Thouless transition.
  • This study provides insights into the dynamics of phase transitions in non-equilibrium systems.
  • The findings contribute to the understanding of quantum fluids and emergent phenomena.