Metamorphosis of Goldstone and Soft Fluctuation Modes in Polariton Lasers

极iton凝聚体中KPZ标度的起源

The origin of KPZ-scaling in arrays of polariton condensates

研究一维和二维极iton凝聚体相动力学中KPZ标度的起源，揭示Goldstone模的涨落导致一阶关联函数的幂律行为，确立微观参数与发光相干性质的直接联系。

Photoluminescence and gain/absorption spectra of a driven-dissipative electron-hole-photon condensate

We investigate theoretically nonequilibrium effects on photoluminescence and gain/absorption spectra of a driven-dissipative exciton-polariton condensate, by employing the combined Hartree-Fock-Bogoliubov theory with the generalized random phase approximation extended to the Keldysh formalism. Our calculated photoluminescence spectra is in semiquantitative agreement with experiments, where features such as a blue shift of the emission from the condensate, the appearance of the dispersionless feature of a diffusive Goldstone mode, and the suppression of the dispersive profile of the mode are ob…

Critical fluctuations at a many-body exceptional point

Critical phenomena arise ubiquitously in various context of physics, from condensed matter, high energy physics, cosmology, to biological systems, and consist of slow and long-distance fluctuations near a phase transition or critical point. Usually, these phenomena are associated with the softening of a massive mode. Here we show that a novel, non-Hermitian-induced mechanism of critical phenomena that do not fall into this class can arise in the steady state of generic driven-dissipative many-body systems with coupled binary order parameters such as exciton-polariton condensates and driven-dis…