Figure 5.

(a) Color-coded PL intensity as a function of polarization of the 0D-X lines at B = 2.5 T in Faraday geometry. The two dotted vertical lines show polarization direction of low-energy (θ_l) and high-energy (θ_h) 0D-X lines. A 40° angle between these directions also reflects the presence of anisotropic local strain. (b) Magnetic field dependence of the fine-structure split doublet. (c) Normalized second-order correlation function g⁽²⁾(τ) of the 0D-X lines under nonresonant cw excitation at P = 0.5P_N. The fit (solid line) shows g⁽²⁾(0) = 0.17 and a lifetime of 4.14 ns.