Fig. 4: Spin blockade in lightly n-doped QDs.
TA spectra of n-doped-1 probed at indicated time delays following excitation at a 1Se-1S3/2,h and c 1Pe-1P3/2,h transitions by 624 and 547 nm pulses, respectively. Inset in c is an enlarged view of the slowly growing 1S bleach feature. b TA kinetics probed at the 1 S bleach for n-doped-1 (red circle) and neutral (blue square) samples, scaled at their slowly-decaying tail, in the case of 1Se-1S3/2,h excitation. Inset is the Auger recombination kinetics (green square) obtained by performing a subtraction between the two traces in the main panel and its single-exponential fit to a time constant of 460 ps. d TA kinetics probed at the 1 S bleach for n-doped-1 under 1Se-1S3/2,h (blue square) and 1 Pe-1P3/2,h (red circle) excitations, scaled at their slowly-decaying tail. Inset are the 1S kinetics obtained by performing a subtraction between the two traces in the main panel (green triangle) and the kinetics monitored at the 1P bleach (orange triangle). Black solid line is a fit to the slow relaxation component with a time constant of 9 ps indicative of a spin blockade.
