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Transmission spectra of (a) a bulk sample B9 and (b) a MBE sample Mag at different temperatures in the range of , respectively. The insert in (b) shows the details enclosed in the circle, which manifests clearly the abnormal shift of the absorption edge.
Absorption-coefficient spectra of the B9 sample at different temperatures. The dots are deduced from the spectra depicted in Fig. 1(a), and the dashes are the extrapolated results from Eq. (1).
Temperature dependence of absorption-edge energy for (a) bulk and (b) MBE samples, respectively. The linear range is extrapolated downward with dashes. Corresponding band gap energy predicted by Eq. (2) is plotted in solid line. The data of M17 are upshifted by and those of Mag downshifted by , respectively, for the sake of making the temperature dependence clear in (b).
Composition , thickness , carrier density , and abnormal absorption-edge shift for bulk (marked B) and MBE (marked M) samples, respectively.
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