Existence of bi-excitons and trions in germanium
Zhidkov A.E. , Pokrovskii Ya.E.
The photoluminescence of germanium has been investigated near the exciton condensation threshold at a temperature of 2-5.2 K, for uniaxial compression and in the presence of an electric field. It is shown that the broadening of the long-wavelength exciton band edge is not due to the formation of molecular-type states.