Abstract
We report on a study of the spatial distribution of electron-hole drops in Ge at 2 and 4.6\ifmmode^\circ\else\textdegree\fi{}K, using 3.4-\ensuremath{\mu}m intervalence-band absorption. We find that the cloud of electron-hole drops produced at 2\ifmmode^\circ\else\textdegree\fi{}K decays nearly uniformly. At 4.6\ifmmode^\circ\else\textdegree\fi{}K, decay near the edge of the crystal and at the boundary between the cloud and bulk Ge is more rapid than in the middle of the cloud. The rapid decay near the crystal edge is interpreted in terms of surface recombination of excitons. The results are found to support qualitatively the previously proposed cloud model for decay.
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