Abstract
The excitons in near-surface ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}/\mathrm{GaAs}$ QW's have been investigated by photoluminescence excitation and magnetophotoluminescence spectroscopy. The dielectric enhancement of excitons is demonstrated by measuring the splitting of the $2s$ and $1s$ excitons and the diamagnetic shift of the $1s$ exciton state. In agreement with theoretical calculations the exciton binding energy is found to be enhanced 1.5 times by the dielectric confinement for 5-nm-wide quantum wells with cap layer thicknesses below 3 nm.
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