THz emission of stimulated character was observed in Si/SiGe/Si quantum wel
l (QW) structures doped with boron. The resonance cavity formed by extremel
y parallel-structure planes due to total internal reflection, is necessary
for the emission. The mechanism for the possible population inversion of st
rain-split acceptor levels is proposed. (C) 2000 Elsevier Science B.V. All
rights reserved.