Abstract
A strong anisotropy of the photoluminescence emission of high quality quantum wells parallel and orthogonal to the growth axis is demonstrated. This shows up as a series of impressively sharp photoluminescence lines (≈ 0.1 meV) which are only seen on the cleaved facet of growth interrupted single quantum wells, i.e. orthogonal to the growth axis. It is explained in terms of coupled exciton-photon modes called polaritons, which enhance the coupling to excitons in large QW areas with smooth interfaces. The different emission lines are attributed to distinct areas in the quantum well. Polariton effects for excitons in such finite areas are discussed by a semiclassical theory.
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