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The absorption spectrum of the QWs taken at 4.5 K. Each absorption peak (with energy value) is labeled to the corresponding exciton resonance. The dotted line at 1.649 eV is an eye-guide [see also Fig. 2(c)].
Results of TRFR measurements. (a) measured at with pump and probe energies set at 1.543 eV, in which a response seen at is most likely an interference effect, and (b) . (c) measured at with the probe energy set at 1.649 eV (indicated by dotted line in Fig. 1).
(a) Log-scale plots of the absorbance at for (squares) and (triangles) polarized probe beams in the range of to exciton resonance. The inset is an extension around . The absorbance taken before the excitation with both pump and probe linear-polarized is shown (circles) as reference.
(a) Differential transmission at probe with pump (1.543 eV). (b) at are shown in the range of and exciton resonance.
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