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(a) Orientation of the QWR with respect to the crystallographic axes and definition of the alignment and miscut angles. (b) Illustration of the different morphologies of the and (001) facets. (c) Schematic discontinuity between the QWR segments induced by a misalignment to the direction or by a substrate tilted from the (001) plane toward the direction.
(a) 10 K excited PL spectra of three pairs of QWR samples grown with different nominal thicknesses, either on or (001) substrates. The energy scale is reported relatively to the peak energy of each spectrum. Continuous lines are best fits to the data. (b) 10 K Ti:sapphire excited PL and PLE (two polarizations) spectra measured for 4 nm thick QWRs. The first transitions between electrons and holes states are labeled.
(a) FWHM of the 2 nm thick QWR samples as a function of the miscut angle of the substrate. Different points correspond to positions several millimeters apart on the samples. Inset: 10 K PLE spectra of the sample. (b) Temperature dependence of spectra measured on nominally exact or samples ( excitation, ).
AFM top images of V-groove QWR samples grown on substrates with different (001) miscuts: (a) height profiles measured across the V-grooves; (b) AFM amplitude images; (c) height profiles along the top- facets of the grooves, acquired along the indicated lines.
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