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Dark-field cross-sectional TEM image of the QWR region of sample QWR8.5. The inset shows coordinate axes referred to in the text.
Calculated absorption [(a) and (d)] and experimental PL and PLE spectra [(b) and (c)] of samples QWR8.5 and QWR13. An excitation (detection) energy of (1.56 and ) and power of was used for the PL (PLE) measurements. The solid and dashed lines correspond to light linearly polarized parallel and perpendicular to the QWR axis, respectively. The dashed PLE curves are multiplied by a factor in order to compensate for grating effects of the nonplanarized samples (Ref. 10).
PL (solid lines) and PLE (dashed lines) spectra for four GaAs QW samples. The shaded areas indicate signatures of carrier transfer from n-QW to w-QW. An excitation power of was used and the excitation (detection) energy was for the PL (PLE) measurements.
Calculated electron tunneling rates for the four GaAs QW and QWR samples, respectively, in units of the radiative recombination rate . The solid lines guide the eyes.
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