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(a) as a function of at zero magnetic field where the solid curve is a linear fit. The upper-left inset shows the optical transitions involving the electron spin ground states and the trion states. The lower-right inset shows a modulation absorption scan taken at a sample bias of 0.14 V with a cw optical field and small voltage modulation. Since both the modulated Stark shift and the cw linewidth are smaller than the trion linewidth, the obtained signal is the derivative of the trion absorption line (see Ref. 9). The energy of the zero crossing point (circle) corresponds to the trion transition energy. (b) measurements (offset) for a single pulse train as a function of for different average pulse powers. The shaded regions indicate the change in the transmission with respect to a voltage dependent background (dashed lines) due to detection of the QD radiated field.
(a) measurements taken at zero magnetic field. The solid line is a fit of the data using the second term of Eq. (1). (b) measurements as a function of the square root of the average pump power for and a probe pulse area of approximately . The solid line is an oscillatory fit of the data.
measurements taken at magnetic field values of 3.3 T (bottom) and 6.6 T (top). As the pump-probe delay range is short compared to previously observed electron and heavy-hole coherence times, the data are fit to Eq. (2) taken in the limit of very long spin coherence times (solid curves).
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