Exciton valley dynamics probed by Kerr rotation in WSe2 monolayers

We have experimentally studied the pump-probe Kerr rotation dynamics in ${\mathrm{WSe}}_{2}$ monolayers. This yields a direct measurement of the exciton valley depolarization time ${\ensuremath{\tau}}_{v}$. At $T=4\phantom{\rule{0.28em}{0ex}}\mathrm{K}$, we find ${\ensuremath{\tau}}_{v}\ensuremath{\... View More