Observation of Exciton Spin Transport

This chapter presents the observation of the spin transport of spatially indirect excitons in GaAs coupled quantum wells (CQW). The spin relaxation time of indirect excitons is orders of magnitude longer than the spin relaxation time of direct excitons. In combination with a long lifetime of indirect excitons, this makes possible spin transport of indirect excitons over substantial distances. This chapter covers in detail the theoretical considerations that motivated this experiment.