MAGNETIC-FIELD-INDUCED CHANGES IN THE INTENSITY OF THE LUMINESCENCE DUE TO EXCITONS AND AN ELECTRON-HOLE LIQUID IN GERMANIUM CRYSTALS.

The intensity of the luminescence due to an electron-hole liquid in germanium changed considerably on application of a weak magnetic field. The nature of the change depended on the method used to generate nonequilibrium carriers. In the case of the bulk carrier generation mechanism the effect was due to the nonisothermal nature of the process of condensation of excitons in a nonequilibrium system. In the case of surface generation of electron-hole pairs there was a change in the density of the resultant excitons on increase in the magnetic field; the complex nature of the magnetic-field-induced changes in the intensity of the luminescence due to the electron-hole liquid was governed both by changes in the flux of electrons and holes to nuclei and to drops, as well as by a reduction in the exciton density on increase in the field.