Fig. 3: Polarization-resolved PL from QEs at L1 as a function of applied magnetic field (Faraday geometry).

a PL spectra of QE1 and QE2 as a function of B, showing the splitting of two peaks with increasing B. The energy shifts of defect level and dark conduction band facilitate the hybridization process thus leading to stronger low energy peak radiation of QE. b The PL spectra measured at zero field, showing the fine structure splitting of active neutral QEs. c The fitted g-factors of QE1 and QE2. The peak data is obtained by fitting the peaks with Lorentz lineshape, as shown in the red lines in a. The larger g-factors of QEs stem from the net valence band shift when applying an out-of-plane magnetic field. d, f, h Measured magnetic field-dependent PL of QE3-QE10, no polarizer or wave plate was inserted during the collection. e, g, i Polarization-resolved magnetic field dependent PL of QE3-QE10 which was detected in the circular basis (black lines: σ⁺ configuration; red lines: σ⁻ configuration). All the measurements were performed with a linearly polarized excitation. The spectra are shifted for clarity.