Effects of shallow acceptors in a germanium hot-hole laser
Murav'ev A. V., Pavlov S. G., Orlova E. E., Shastin V. N.
Recombination involving spontaneously emitted optical phonons leads to a significant filling of states of shallow acceptors in a p-Ge hot-hole laser. Under conditions corresponding to photoionization of the ground state, the recombination creates a population inversion involving these states. Calculations explain several features observed experimentally, including the effects of stimulated emission in impurity absorption lines.