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Recent experiments have shown several effects indicative of Bose-Einsteincondensation in polaritons in GaAs-based microcavity structures when a harmonicpotential trap for the two-dimensional polaritons is created by applied stress.These effects include both real-space and momentum-space narrowing, first-ordercoherence, and onset of linear polarization above a particle density threshold.Similar effects have been seen in systems without traps, raising the questionof how important the role of the trap is in these experiments. In this paper wepresent results for both trapped conditions and resonant, non-trappedconditions in the same sample. We find that the results are qualitativelydifferent, with two distinct types of transitions. At low density in the trap,the polaritons remain in the strong-coupling regime while going through thethreshold for onset of coherence; at higher density, there is a differentthreshold behavior which occurs with weak coupling and can be identified withlasing; this transition occurs both with and without a trap.

The role of the stress trap in polariton quasiequilibrium condensation in GaAs microcavities