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. 2016 Sep 2;7:12715. doi: 10.1038/ncomms12715

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Copyright © 2016, The Author(s)

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(a) Direct comparison of TRKR traces on the few-picosecond timescale at A exciton resonance (A exciton res.), trion resonance (X⁻_Sres. and X⁻_Tres.) and B exciton resonance (B exciton res.) energies. (b) Comparison of A and B exciton TRKR traces on the 100 ps timescale with logarithmic amplitude scale. (c) TRKR trace at the B exciton resonance. A bimolecular fit to the data (open circles) is indicated by the solid red line. (d) Schematic illustration of A and B exciton configurations for WS₂ in the K⁺ valley. The yellow and orange arrows indicate the conduction-band splin-flip and radiative recombination processes leading to the decay of the A exciton Kerr signal.