(a) Typical macro-PL spectrum of N δ-doped GaAs at T = 3.2 K and P exc = 0.06 W/cm2. (b) and (c) are exciton fine structure of the 1.444- and 1.493-eV lines, respectively, for different observation area at T = 4.4 K and P exc = 0.5 W/cm2. The N-pair numbers estimated by the PL imaging measurement were 600, 20, 3, and 1 from the top spectrum.
(Color online) Linearly polarized magneto-PL spectra for the (a) 1.444- and (b) 1.493-eV lines, respectively, at T = 4.4 K and P exc = 0.34 W/cm2. The magnetic field was applied along  in the Faraday configuration. The solid and dotted lines are the results for the  and [–110] polarizations, respectively. The bottom panels show the magnetic-field evolution of the PL-peak energy. The solid and open circles are the PL lines observed for the  and [−110] polarizations, respectively, at the zero magnetic field. The squares are unexpected PL lines in the C 2 symmetry in the  direction.
(Color online) Magnetic field evolution of the average energy, ΔE ave, of the 1.444- and 1.493-eV lines. ΔE ave was defined by the average energy of the exciton fine structure indicated by the solid and open circles in Fig. 2. The circles and squares are the results for the 1.444- and 1.493-eV lines, respectively.
(Color online) PL decay dynamics of the 1.444- and 1.493-eV lines at T = 4.4 K and P exc = 0.007 W/cm2. The circles and squares are the results for the 1.444- and 1.493-eV lines, respectively. The dotted curve indicates the laser profile. The profiles have been normalized by the intensity at 0 ns.
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