S. Guha et al., PHOTOLUMINESCENCE OF SHORT-PERIOD GAAS ALAS SUPERLATTICES - A HYDROSTATIC-PRESSURE AND TEMPERATURE STUDY/, Physical review. B, Condensed matter, 58(11), 1998, pp. 7222-7229
The temperature and pressure dependence of type-I and -II transitions
from photoluminescence (PL) spectra in a series of (GaAs)(m)/(AlAs)(m)
superlattices show that the temperature dependence of energy bands ca
n be described very well with a Bose-Einstein-type equation. From thes
e measurements the parameters that describe the temperature dependence
of excitonic transition energies and the corresponding broadening of
the PL line are deduced. The pressure dependence of the PL linewidths
of the type-I exciton as a function of pressure and temperature yield
the intervalley deformation potential. Beyond the type-I-type-II cross
over, the PL linewidth increases as a function of both pressure and te
mperature. The electron-phonon deformation potential for Gamma-X scatt
ering is found to be temperature dependent.