Full text loading...
(Color online) PL spectra of a single CdTe quantum dot as a function of cw excitation power density from 0.8 kW/cm2 (bottom spectrum) to 480 kW/cm2 (top spectrum). Exponents of the fitted power law functions are given next to the identified transitions. The method for determining the inter-shell splitting is shown schematically.
(Color online) (a–e) Distributions of the s-p splitting for different single CdTe QDs for each sample. (f) Evaluated average value of the s-p splitting as a function of the CdTe layer thickness. The error bars indicate the FWHM of the s-p splitting distribution. (g-h) Formation schemes for QDs with a large and small (small and large) lateral (vertical) size. (i) s-p splitting plotted as a function of the average ensemble emission energy. The solid line is a guide for the eye.
(Color online) Temporal PL traces of the X (blue diamonds), 2X (red circles), and 3X* (green triangles) transitions excited with P = 0.8 kW/cm2. Solid lines show the results of rate equation model calculations. The excitation profile is wX (t) = G/τexc exp(−t/τexc )θ(t), where G is the excitation amplitude, θ(t) is the Heaviside function and the fitted times are τ X = 210 ps, τ 2 X = 160 ps, τ 3 X * = 110 ps, and τexc = 45 ps.
Article metrics loading...