Evidence for the〈110〉Swelling Constant Energy Surface for Heavy Holes in Silicon

A newly devised experimental technique has revealed that the puzzling weak-field anisotropy of the galvanomagnetic effects in $p$-type silicon above 77°K belongs, according to our classification, to the last of the four possible types for cubic semiconductors. The strange behavior is ascribable to the growth of the $〈110〉$ swelling energy contour for the heavy-hole band. A brief description is given of the calculation of the nonparabolicity with the recent band parameters and of the calculation of the conductivity tensor for a fictitious energy surface.