Anisotropy of the Conductivity of n‐Type Germanium at High Electric Fields

Measurements of the hot electron conductivity anisotropy in germanium are made at lattice temperatures of 78 and 290 °K. The conductivity is measured both parallel and perpendicular to the direction of the high electric field. From the data the products n(i)〈τ〉(i) are obtained for each valley for fields in the 〈110〉 and 〈111〉 crystallographical directions. The electron “temperatures” and relative populations of the valleys are calculated. The results are not in agreement with the theory of Reik and Risken applied to n‐type germanium. The experimental results are compared with the theoretical ones obtained using the electron temperature approximation.