Figure 10

PL spectra for crossed linear polarizations, taken at T = 10 K with excitation wave length λ = 532 nm along $[0\overline{1}1]$ and [011] directions for samples (a) A and (b) B. The degree of linear polarization: $({\text{Pol}}_{[0\overline{1}1]}-{\text{Pol}}_{[011]})/({\text{Pol}}_{[0\overline{1}1]}+{\text{Pol}}_{[011]})$ has been included in these panels. (c) PL peak position as a function of the excitation intensity.