Anisotropy of Phonon Emission from Hot Electrons in Germanium
We have measured quantitatively the anisotropy of the electron — acoustical phonon scattering in n-germanium in five directions of the (110) plane utilizing tunneling junctions for calibrated detection of the phonon radiation emitted from a small avalanche breakdown region in the germanium surface. For comparison and evaluation of phonon focusing a constantan heater and a tunneling junction were also used as phonon sources. A similar experiment has been reported by A. Zylbersztejn /1/, but he could only compare the ratio of the amplitudes of longitudinal and transverse phonon pulses in a given crystal direction to the calculation.
KeywordsAnisotropy Helium Germanium
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