Electron-Electron Interaction in Warm Electrons

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Effects of the electron-electron interaction on the distribution function of warm electrons in semiconductors are investigated by the Born approximation with a screened Coulomb potential. The theory shows that the effect of the e-e interaction is remarkable, unless the density of the electrons is quite small. We compare the theoretical results to Gunn’s experiment. He observed the behaviors of the warm electrons n-type germanium doped with Sb at 77°K by changing the impurity concentration from 6.6×1013 to 2.9×1016 cm−3. We find that the theory does not give a good agreement with the experiment, when we do not consider the e-e interaction. The theory with the e-e interaction, however, agrees quite well with the experiment all through the impurity concentrations.

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