“…The energetic order of the heavy and light hole bands is reverted when moving from the uniaxial to the biaxial case. Most of the theoretical work concerning Ge light emission utilizes k·p theory including 6 bands (Aldaghri et al, 2012;Chang and Cheng, 2013;Virgilio et al, 2013), 8 bands (Zhu et al, 2010;Wirths et al, 2013b), or 30 bands (El Kurdi et al, 2010). The latter is not restricted to the Brillouin-zone center but describes the full energy dispersion.…”