The electron bandstructure for germanium (diamond structure) was calculated using the program Quantum Espresso (version 5.3.0). Ge is a semiconductor with a direct bandgap of 0.67 eV. The calculated bandgap was adjusted to get the right gap. The course of the calculated bands correlates to comparative bandstructures for Ge (cf. MaterialsDesign) .
Diamond structure of Ge Source: Wikipedia
Density of states