Abstract
Time- and angle-resolved photoemission spectroscopy provides the ability to obtain deeper insight into the wave functions of excitons in semiconductors. In this paper, the method reveals that the exciton formed on InP(110)-(1x1) surface has a spheroidal radial probability density; the spread is 44 \AA{} in the planes parallel to the surface, while it is confined within the surface region with 6-\AA{} depth. Both the reduced screening and two-dimensional confinements at the surface govern the quasi--two-dimensional characteristics.
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