Ag. Milekhin et al., LOCALIZATION OF TRANSVERSE OPTICAL PHONONS OF GAAS IN GAAS ALXGA1-XASPERIODIC STRUCTURES WITH PAIRED QUANTUM-WELLS, JETP letters, 59(7), 1994, pp. 493-496
A localization of transverse optical phonons in GaAs layers separated
by ultrathin AlxGa1-xAs barriers has been studied experimentally. It i
s shown that an AlAs layer 1 monolayer thick constitutes a barrier for
GaAs phonons, while an AlxGa1-xAs layer with x less-than-or-equal-to
0.5 is penetrable.