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The photoluminescence dynamics of a microscopic gas of indirect excitonstrapped in coupled quantum wells is probed at very low bath temperature(approximately 350 mK). Our experiments reveal the non linear energy relaxationcharacteristics of indirect excitons. Particularly, we observe that theexcitons dynamics is strongly correlated with the screening of structuraldisorder by repulsive exciton-exciton interactions. For our experiments wheretwo-dimensional excitonic states are gradually defined, the distinctiveenhancement of the exciton scattering rate towards lowest energy states withincreasing density does not reveal unambiguously quantum statistical effectssuch as Bose stimulation.

Quantum Signature Blurred by Disorder in Indirect Exciton Gases