Spatial coherence of a polariton condensate in 1D acoustic lattice

Abstract

Several mechanisms are discussed which could determine the spatial coherence of a polariton condensate confined to a one dimensional wire. The mechanisms considered are polariton–polariton interactions, disorder scattering and non‐equilibrium occupation of finite momentum modes. For each case, the shape of the resulting spatial coherence function g(1)(x) is analysed. The results are compared with the experimental data on a polariton condensate in an acoustic lattice from E. A. Cerda‐Mendez et al. [Phys. Rev. Lett. 105, 116402 (2010)]. It is concluded that the shape of g(1)(x) can only be explained by non‐equilibrium effects, and that ∼10 modes are occupied in the experimental system.

Topological enhancement of exciton-polariton coherence with non-Hermitian morphing

“…This formula is equivalent to that used in [71], however, assuming a Gaussian energy distribution function. One might have expected a Bose-Einstein distribution; however, it was shown that this results in a poor fit to experiments given the nonequilibrium nature of polariton systems [71].…”

“…This formula is equivalent to that used in [71], however, assuming a Gaussian energy distribution function. One might have expected a Bose-Einstein distribution; however, it was shown that this results in a poor fit to experiments given the nonequilibrium nature of polariton systems [71]. Here I (x, y) is the intensity profile of polaritons, E n is the energy of the modes, E g is the energy of the ground state, and δE is the energy fluctuation.…”