Loss of coherence in cavity-polariton condensates: effect of disorder vs. exciton reservoir
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Time evolution of long-range spatial coherence in a freely decaying cavity-polariton condensate excited resonantly in a high-Q GaAs microcavity (MC) is found to be qualitatively different from that in nonresonantly excited condensates. The first-order spatial correlation function g(1)(r1, r2) in response to resonant 1.5 ps pump pulses at normal incidence leaving the exciton reservoir empty is found to be nearly independent of the excitation density. g(1) exceeds 0.7 within the excited spot and decreases very slowly in the decaying and expanding condensate. It remains above 0.5 until the polariton blueshift α|ψ2| gets comparable to the characteristic amplitude of the disorder potential δELP . The disorder is found to reveal itself at α|ψ2| ≤ δELP in fast and short-range phase fluctuations as well as vortex formation. They lead to oscillations in g(1)(t), but have little effect on the overall coherence, which is well reproduced in the framework of the Gross-Pitaevskii equations.
Demenev , A A , Grishina , Y V , Kulakovskii , V D , Schneider , C & Höfling , S 2016 , ' Loss of coherence in cavity-polariton condensates: effect of disorder vs. exciton reservoir ' , Physical Review. B, Condensed matter and materials physics , vol. 94 , no. 19 , 195302 . https://doi.org/10.1103/PhysRevB.94.195302
Physical Review. B, Condensed matter and materials physics
© 2016, American Physical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://journals.aps.org/prb/ https://doi.org/10.1103/PhysRevB.94.195302