We have studied in the gigahertz range the ultrasonic attenuation by electron-hole droplets in Ge as function of their size. A broad bump is attributed to the resonant excitation of nonresolved capillary modes. From a detailed analysis of the line shape we derive a value of 3×{} 10^-4 erg/cm² for the surface tension of droplets. This is the first mechanical measurement of this quantity.
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Etienne et al. (1976) studied this question.
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