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We have performed real and momentum space spin-dependent spectroscopy ofspontaneously formed exciton polariton condensates for a non-resonant pumpingscheme. Under linearly polarized pump, our results can be understood in termsof spin-dependent Boltzmann equations in a two-state model. This suggests thatrelaxation into the ground state occurs after multiple phonon scattering eventsand only one polariton-polariton scattering. For the circular pumping case, inwhich only excitons of one spin are injected, a bottleneck effect is observed,implying inefficient relaxation.

Signature of the microcavity exciton-polariton relaxation mechanism in the polarization of emitted light