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We measure the spin-resolved transport of dipolar excitons in a biased GaAsdouble quantum well structure. From these measurements we extract both spinlifetime and mobility of the excitons. We find that below a temperature of$4.8$K, there is a sharp increase in the spin lifetime of the excitons,together with a sharp reduction in their mobility. Below a critical power thespin lifetime increases with increasing mobility and density, while above thecritical power the opposite trend is observed. We interpret this transition asan evidence of the interplay between two different spin dephasing mechanisms:at low mobility the dephasing is dominated by the hyperfine interaction withthe lattice nuclei spins, while at higher mobility the spin-orbit interactiondominates, and a Dyakonov-Perel spin relaxation takes over. The excitationpower and temperature regime where the hyperfine interaction induced spindephasing is observed correlates with the regime where a dark dipolar quantumliquid was reported recently on a similar sample.

Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons