Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition
arXiv:2407.10506 · doi:10.1038/s42005-025-01977-7
Abstract
The emergence of spatial coherence in a confined two-dimensional Bose gas of exciton-polaritons with tuneable interactions offers a unique opportunity to explore the role of interactions in a phase transition in a driven-dissipative quantum system, where both the phase transition and thermalisation are mediated by interactions. We investigate, experimentally and numerically, the phase correlations and steady-state properties of the gas over a wide range of interaction strengths by varying the photonic/excitonic fraction of the polaritons and their density. We find that the first order spatial coherence function exhibits algebraic decay consistent with the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Surprisingly, the exponent of the algebraic decay is inversely proportional to the coherent density of polaritons, in analogy to equilibrium superfluids above the BKT transition, but with a different proportionality constant. Our work paves the way for future investigations of the phenomenon of phase transitions and superfluidity in a driven-dissipative setting
arXiv comment11 pages, 6 figures
References in corpus (42)
- Theory of Bose-Einstein condensation in trapped gases
- Feshbach Resonances in Ultracold Gases
- Quantum fluids of light
- Exciton-polariton condensates
- Bose-Einstein condensation of photons in an optical microcavity
- Excitations in a non-equilibrium Bose-Einstein condensate of exciton-polaritons
- Emergence of coherence in a uniform quasi-two-dimensional Bose gas
- Bose-Einstein Condensation of Long-Lifetime Polaritons in Thermal Equilibrium
- XMDS2: Fast, scalable simulation of coupled stochastic partial differential equations
- Two-Dimensional Weakly Interacting Bose Gas in the Fluctuation Region
- Polariton Condensation in an optically induced 2D potentia
- Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
- Energy Relaxation in a 1-D Polariton Condensate
- Polaritons are Not Weakly Interacting: Direct Measurement of the Polariton-Polariton Interaction Strength
- Observation of KPZ universal scaling in a one-dimensional polariton condensate
- Topological order and equilibrium in a condensate of exciton-polaritons
- The trapped two-dimensional Bose gas: from Bose-Einstein condensation to Berezinskii-Kosterlitz-Thouless physics
- Direct measurement of polariton-polariton interaction strength in the Thomas-Fermi regime of exciton-polariton condensation
- Slow reflection and two-photon generation of microcavity exciton-polaritons
- Non-equilibrium quasi-condensates in reduced dimensions
- Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas
- Dynamical critical exponents in driven-dissipative quantum systems
- Quasicondensation and coherence in the quasi-two-dimensional trapped Bose gas
- Connecting Berezinskii-Kosterlitz-Thouless and BEC phase transitions by tuning interactions in a trapped gas
- Observation of quantum depletion in a nonequilibrium exciton-polariton condensate
- Onset of vortex clustering and inverse energy cascade in dissipative quantum fluids
- Adiabatic approximation and fluctuations in exciton-polariton condensates
- Polariton interactions in microcavities with atomically thin semiconductor layers
- Bose-Einstein condensation and Berezinskii-Kosterlitz-Thouless transition in 2D Nonlinear Schrödinger model
- Kibble-Zurek mechanism in driven-dissipative systems crossing a non-equilibrium phase transition
- Coherently driven microcavity-polaritons and the question of superfluidity
- Low-energy collective oscillations and Bogoliubov sound in an exciton-polariton condensate
- Transition from Bose-Einstein Condensate to Berezinskii-Kosterlitz-Thouless Phase
- Effect of optically-induced potential on the energy of trapped exciton-polaritons below the condensation threshold
- Quench dynamics of an ultracold two-dimensional Bose gas
- Non-equilibrium Berezinskii-Kosterlitz-Thouless transition in driven-dissipative condensates
- Dephasing effects on coherent exciton-polaritons and the breaking of the strong coupling regime
- Noise-induced transition from superfluid to vortex state in two-dimensional nonequilibrium polariton condensates
- Bogoliubov excitations of a polariton condensate in dynamical equilibrium with an incoherent reservoir
- Spatiotemporal scaling of two-dimensional nonequilibrium exciton-polariton systems with weak interactions
- Critical fluctuations in a confined driven-dissipative quantum condensate
- Noise-induced transition from superfluid to vortex state in two-dimensional nonequilibrium polariton condensates -- semi-analytical treatment