The hot-electron characteristic of $n$-germanium at room temperature is theoretically derived taking into account the effects of the $〈100〉$ valleys and the nonparabolicity of the $〈111〉$ valleys. It is shown that the experimental results may be explained by theory only when both these effects are included.

• Received 10 August 1971

DOI:https://doi.org/10.1103/PhysRevB.6.1399