Abstract
Direct hot-luminescence spectra for AlSb are presented. The luminescence is attributed to recombination on acceptors of hot electrons photocreated from the heavy- and light-hole bands. The acceptor binding energy and the effective masses of light holes and conduction electrons near \ensuremath{\Gamma} are deduced from the experimental curves: ${E}_{A}$=30\ifmmode\pm\else\textpm\fi{}5 meV; ${m}_{\mathrm{vl}}$=(0.1\ifmmode\pm\else\textpm\fi{}0.1)${m}_{0}$; ${m}_{c}$=(0.14\ifmmode\pm\else\textpm\fi{}0.20)${m}_{0}$. The high degree of circular polarization (${P}_{c}$\ensuremath{\simeq}0.42) shows the anisotropy of the momentum distribution and the correlation between the spin and the momentum of the electrons. The dynamics of the electrons in the \ensuremath{\Gamma} valley in AlSb shows that the shape of the hot luminescence lines is strongly dependent on the efficiency of electron scattering towards the X valleys.
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