SEM image of a nanowire grown by annealing under Ar flow for at .
PL at and and PLE spectra at from the nanowire area. The dashed curve is a Gaussian approximation to the PLE band.
Evolution of time decay with temperature of the peak centered at . The dots are experimental results and the solid line is the fit to the three level model, Eq. (1) in the text. Inset: Transients at and . The dotted curves are experimental results and the solid lines are fits to single exponentials. Excitation energy was .
Qualitative configurational coordinate diagram of levels in . The parabola minima , , and are drawn in the right for clarity.
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