Abstract
AbstractSeveral 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.
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