In the present thesis we discuss experimental work related to the
Bose-Einstein condensation (BEC) of bound electron-hole pairs
(excitons) in GaAs coupled quantum wells. Coupled quantum wells
were chosen because in these structures the lifetime of excitons
can be extended to the mus range. In the experiments, by measuring
their diffusion, we have proved that excitons can move freely in
two dimensions, and we have proved that they can reach thermal
equilibrium during their lifetime in a confining stress potential
in the plane of the quantum wells. Having an equilibrium ensemble
of these quasi-particles enabled us to measure their interaction
potential in a controlled environment. We also introduce a simple
theoretical model that accounts for the experimental findings on
interaction. In the final chapter we discuss a new phenomenon at
high stress, and evaluate its possible relation to excitonic BEC.
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