Publication
Surface Science
Paper

The role of coherence length of excitons in thin quantum wells

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Abstract

Using time-resolved luminescence we measure the energy relaxation of excitons in thin quantum wells. We find that the excitons relax by losing potential energy in a drift-diffusion motion driven by potential fluctuations in the quantum well plane, which are longer than the coherence length of the excitons. For a constant interface quality the coherence length strongly decreases with decreasing well width so that drift-diffusion dominates the exciton relaxation in thin quantum wells. © 1992.

Date

01 Jan 1992

Publication

Surface Science

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