We consider the surfaces of the condensed phase of excitons in semiconductors, the electron-hole liquid (EHL). By using the theory of the inhomogeneous electron gas and a variational technique we estimate the surface tension for the EHL in Ge to be 10^-4 erg/cm²; the carrier density in the surface region varies on a scale of {≈} 50 {}. We suggest an experiment to measure the surface tension of the EHL.
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Sander et al. (1973) studied this question.
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