Figure 3: A exciton valley polarization dynamics.
From: Trion fine structure and coupled spin–valley dynamics in monolayer tungsten disulfide
(a) Helicity dependence of TRKR signal for the laser energy tuned to the A exciton resonance (exc. res.). (b) Direct comparison of differential reflectivity (Diff. reflect.) and TRKR traces (Kerr rot.) on the few-picosecond timescale at the A exciton resonance energy. (c) Log. scale plot of TRKR traces at the A exciton resonance (A exciton res.) on the 100 ps timescale. A bimolecular fit to the data (open circles) is indicated by the solid red line. The difference between this fit and the data is indicated by the solid blue line. The insets sketch the configuration of optically bright (dark) excitons, which dominate the Kerr signal at early (late) delay times Δt.
