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(Color online) Grey-scale intensity contour plots of the collected photon wavelength as a function of applied bias for single dots in the (a) Si- and (b) C-doped sample using 10 and 20 s integration times, respectively. The integrated intensity for X1−, X0, and X1+ at each applied bias for the Si- and C-doped samples is shown in (c) and (d), respectively. (e) The differential transmission contrast for X1+ and X0 for QD1 in the Be-doped sample. A resonant laser power of 0.4 nW was used with linear polarization so that only one state of the X0 fine-structure is excited. As shown in Fig. 4, this driving power is still greater than the saturation power for this X1+ transition.
(Color online) Typical transmission spectra (T = 4 K) using a resonant laser power of 0.08 nW and circular polarization for the X0 transitions from the Si-doped (a) and C-doped (c) samples. Linewidth (full-width-at-half-maximum) statistics for each sample are shown in the histograms (b) and (d). The time averaged linewidth of the laser is ∼1 MHz on a timescale of 1 s.
(Color online) Typical spectra using linearly polarized resonant excitation for charged excitons from the 3 samples.
(Color online) (a) Saturation curves for the X0 and X1+ transitions from QD1 and the X1+ transition from QD3. The solid line for QD1 X0 is a fit (with α0 = 0.0245, linewidth = 3.2 µeV, and E = 1.3266 eV) based on saturation of a two-level transition.11,18 The solid lines for the X1+ data are guides to the eye.
(Color online) The evolution of the lineshape as a function of excitation power (a)-(e) for QD3 X1+ from the Be-doped sample. The solid lines are fits using q as a free parameter. The Fano visibility as a function of power for this dot and also QD1 X1+ is shown in (f).
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