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
11 pages, 6 figures
References in corpus (22)
- 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
- XMDS2: Fast, scalable simulation of coupled stochastic partial differential equations
- Critical Point of an Interacting Two-Dimensional Atomic Bose Gas
- Energy Relaxation in a 1-D Polariton Condensate
- Observation of KPZ universal scaling in a one-dimensional polariton condensate
- The trapped two-dimensional Bose gas: from Bose-Einstein condensation to Berezinskii-Kosterlitz-Thouless physics
- Slow reflection and two-photon generation of microcavity exciton-polaritons
- Connecting Berezinskii-Kosterlitz-Thouless and BEC phase transitions by tuning interactions in a trapped gas
- Onset of vortex clustering and inverse energy cascade in dissipative quantum fluids
- Polariton interactions in microcavities with atomically thin semiconductor layers
- Kibble-Zurek mechanism in driven-dissipative systems crossing a non-equilibrium phase transition
- Low-energy collective oscillations and Bogoliubov sound in an exciton-polariton condensate
- Non-equilibrium Berezinskii-Kosterlitz-Thouless transition in driven-dissipative condensates
- 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