On equilibrium in the free carriers-free excitons-electron-hole drops system in germanium at 4.2 K

Kinetics of free carriers (FC) and free excitons (FE) in germanium under condensation conditions at 4.2K is studied. Spectra of magnetoplasma resonance (MPR) during impulse excitation by neodymium laser radiation are studied. MPR spectra obtained by SHF spectrometer during various inhibitions of strobe pulses relatively to an exciting laser pulse, are presented. MPR spectra modelling with a computer has resulted in obtaining time dependences of FC concentration and collision frequencies. The shape of experimental MPR spectra lines undergoes considerable changes in time. Spectra form permits to find considerable changes in the collision frequency in the process of recombination of electron-hole drops (EHD) FC kinetics can not be equal to the signal form observed due to changes of collision frequency in time. The solutions of kinetic equation system are analyzed. The results obtained show that FC and FE kinetics observed in germanium at 4.2K is not described by ordinary kinetic equations. Thus, the problem of phase equilibrium nature in the EHD-FE-FC system is still open