Fig. 3: Transient optical responses under high-power pump.
From: Bandgap control in two-dimensional semiconductors via coherent doping of plasmonic hot electrons
a Intensity plot of ΔT/T spectra of PC-WS2 under 100 μJ cm−2 pump fluence at θ = 22°, where orange (blue) colour represents the maximum (minimum) value. b Delay time dependent spectra (ΔT/T) at energies of UP, LP, and exciton B extracted from panel a. Solid curves are plotted only for visual guidance. c ΔT/T spectra at different delay times, extracted from the white dashed frame in a; red dashed vertical line indicates the onset of renormalised bandgap. d comparison of ΔT/T spectra at delay of 0.96 ps between PC-WS2 (left) and WS2 MLs (right) under gradually increasing pump fluence; horizontal lines indicate the ΔT/T amplitudes of zero.
