Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-02-07
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
To appear in Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/19/29/295208
The theory of the linear optical response of excitons in quantum wells and polaritons in planar semiconductor microcavities is reviewed, in the light of the existing experiments. For quantum well excitons, it is shown that disorder mainly affects the exciton center-of-mass motion and is modeled by an effective Schroedinger equation in two dimensions. For polaritons, a unified model accounting for quantum well roughness and fluctuations of the microcavity thickness is developed. Numerical results confirm that polaritons are mostly affected by disorder acting on the photon component, thus confirming existing studies on the influence of exciton disorder. The polariton localization length is estimated to be in the few-micrometer range, depending on the amplitude of disorder, in agreement with recent experimental findings.
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