Possibly, an electron and a hole in germanium could form a stable holeium state, in which they orbited about their common center of mass in a manner alike to a Bohr hydrogen atom. Determine what would be the rough size of an ‘atom’ and what would be its ionization energy? Determine at what maximum temperature would be estimated to observe such a state?
The effective mass of electrons in Ge is: m*/mass of electron is 0.12. The effective mass of holes in Ge is m*/m (of electron) is 0.21. And the dielectric constant of Ge is k =16.0.