Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-03-09
Phys. Rev. B 80, 045317 (2009)
Physics
Condensed Matter
Other Condensed Matter
9 pages, 12 figures
Scientific paper
10.1103/PhysRevB.80.045317
Real and momentum space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under non resonant excitation using a laser source with reduced intensity fluctuations on the timescale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower energy modes are strongly localized by the photonic potential disorder on a scale of few microns. Higher energy modes have finite k-vectors and are delocalized over 10-15 microns. All the modes exhibit long range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local photonic potential and the reduced intensity fluctuations of the excitation laser.
Andre Régis
Bradley Aaron R.
Dang Le Si
Deveaud-Plédran Benoit
Guda K.
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