Transverse Negative Resistance inn-Type Germanium

For $n$-type germanium the mobility in the [001] direction in the presence of a strong electric field in the [110] direction has been calculated using a detailed model of the material including higher $〈100〉$ minima. The method of calculation is a Monte Carlo approach capable of giving differential quantities. At room temperature no instability is found, while at 77 °K an instability is obtained if the scattering rate between $〈111〉$ and $〈100〉$ minima is sufficiently strong.