Abstract
A comprehensive investigation of the optical properties of InAs/InP(001) quantum wires(QWrs) and their parent quantum well system formed by the deposition of 4 ML(monolayers) of InAs on InP is carried out by means of temperature dependentphotoluminescence (PL) and Fourier transform infrared spectroscopy. Unusual two-branchswitching of the excitonic PL band maxima is revealed in the temperature dependence forboth wires and wells. This is interpreted in terms of the thermal activation ofexcitonic ground states of the confined nanostructures. Strong modification of theabsorbance line shape leading to the appearance of flat spectral regions in theroom temperature spectrum of a QWr sample is interpreted in terms of thermallyinduced change of the dimensionality: from 1D to anisotropic 2D. This change ofdimensionality is detected also in the polarized absorbance measurements through thedisappearance or significant reduction of the polarization anisotropy in the regions of thehh1–e1 (hh: heavy hole; e: electron) and lh1–e1 (lh: light hole) transitions inQWrs.
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