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We investigate the effects of disorder on the propagation of one-dimensionalpolariton condensates in semiconductor microcavities. We observe a strongsuppression of the backscattering produced by the imperfections of thestructure when increasing the condensate density. This suppression occurs inthe supersonic regime and is simultaneous to the onset of parametricinstabilities which enable the "hopping" of the condensate through thedisorder. Our results evidence a new mechanism for the frictionless flow ofpolaritons at high speeds.

Backscattering suppression in supersonic 1D polariton condensates