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The formation of a dense Bose-Einstein condensate in dark spin states oftwo-dimensional dipolar excitons is shown to be driven by a dynamicaltransition to the long-lived dark states. The condensate is stabilized bystrong dipole-dipole interactions up to densities high enough for a darkquantum liquid to form. The persistence of dark condensation was observed inrecent experiments. A model describing the non-equilibrium dynamics ofexternally driven coupled dark and bright condensates reproduces the step-likedependence of the exciton density on the pump power or on temperature. Thisunique condensate dynamics demonstrates the possibility of observing newunexpected collective phenomena in coupled condensed Bose systems, where theparticle number is not conserved.

Dynamical formation and interaction-induced stabilization of dark condensates of dipolar excitons