Temperature Dependence of the Wavelength-Modulation Spectra of GaAs

Abstract

Wavelength-modulation spectroscopy is used to obtain the temperature dependence of the reflectivity spectrum for GaAs. Results are given in the regions of the ${E}_{1}$ doublet and the major ${E}_{2}$ peak at 5, 80, 150, 225, and 300\ifmmode^\circ\else\textdegree\fi{}K. The theoretical temperature dependence in these regions is obtained through use of Debye-Waller factors and thermal expansion coefficients in an empirical pseudopotential calculation of the ${\ensuremath{\Lambda}}_{3}\ensuremath{-}{\ensuremath{\Lambda}}_{1}$ and ${\ensuremath{\Sigma}}_{2}\ensuremath{-}{\ensuremath{\Sigma}}_{1}$ energy splittings.