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PV: Plenarvorträge

PV II

PV II: Plenarvortrag

Montag, 2. März 2026, 10:30–11:15, RW 1

Universal scaling laws in the coherence decay of polariton Bose Einstein condensates — •Jacqueline Bloch — Center for Nanoscience and Nanotechnology, Paris-Saclay University/CNRS, 10 bd Thomas Gobert, 91120 Palaiseau, France

Cavity polaritons, hybrid light-matter quasiparticles emerging from the strong coupling between photons confined in cavities and excitonic excitations [1] provide a powerful platform to explore the physics of Bose Einstein condensation in a driven dissipative context. In 2015, it was discovered that under certain excitation conditions, the phase dynamics of a polariton condensates is governed by the celebrated Kardar Parisi Zhang (KPZ) equation [2-6]. This means that the spatio-temporal coherence decay should reveal universal KPZ scaling laws. The full phase diagram of these out of equilibrium condensates was then explored theoretically both in 1D [7] and 2D [8] and the very existence of a KPZ phase in 2D is a highly debated topic.

In the present talk, after a general introduction about polariton condensates, I will review experimental investigations of their coherence properties. I will describe our experimental demonstration of KPZ universal behavior in 1D [9] and then discuss our recent interferometry experiments realized in 2D. Depending on the strength of the non-linearity in the system (that can be varied changing the detuning between the exciton resonance and the cavity mode), different scaling laws in the spatio-temporal decay of the coherence are revealed. Our results hints toward a cross over between a diffusive Edward Wilkinson regime and a superdiffusive KPZ regime.

This work highlights the profound difference between driven-dissipative out of equilibrium condensates and their equilibrium counterparts.

[1] I. Carusotto, C Ciuti, Rev. Mod. Phys. 85, 299 (2013)

[2] M. Kardar, G. Parisi, Y. C. Zhang, Phys. Rev. Lett. 56, 889 (1986)

[3] E. Altman, et al., Phys. Rev. X 5, 011017 (2015)

[4] K. Ji, et al., Phys. Rev. B 91, 045301 (2015)

[5] L. He, et al., Phys. Rev. B 92, 155307 (2015)

[6] L. He et al, Phys. Rev. Lett. 118, 085301 (2017)

[7] F. Vercesi et al., Phys. Rev. Research 5, 043062 (2023)

[8] F. Helluin et al., Phys. Rev. Research 7, 033103 (2025)

[9] Q. Fontaine et al, Nature 608, 687 (2022)