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Monolayer transition metal dichalcogenides (TMD) have immense potential forfuture spintronic and valleytronic applications due to their two-dimensionalnature and long spin/valley lifetimes. We investigate the origin of theselong-lived states in n-type WS2 using time-resolved Kerr rotation microscopyand photoluminescence microscopy with ~1 micron spatial resolution. Comparingthe spatial dependence of the Kerr rotation signal and the photoluminescencereveals a correlation with neutral exciton emission, which is likely due to thetransfer of angular momentum to resident conduction electrons with longspin/valley lifetimes. In addition, we observe an unexpected anticorrelationbetween the Kerr rotation and trion emission, which provides evidence for thepresence of long-lived spin/valley-polarized dark trions. We also find that thespin/valley polarization in WS2 is robust to magnetic fields up to 700 mT,indicative of spins and valleys that are stabilized with strong spin-orbitfields.

Imaging Spin Dynamics in Monolayer WS2 by Time-Resolved Kerr Rotation Microscopy