Determination of some parameters of band structure of two-valley In$_{1-x}$Ga$_x$P alloys

Some parameters of the band structure in the two-band region In$_{1-x}$Ga$_x$P are determined from the experimental curves of the temperature dependence of the concentration of free electrons. It is shown that the observed effective mass of electrons in the two-band region undergoes a sharp change, which is the result of the redistribution of electrons between valleys.