Dynamics of Magnetic Order in Monolayer Semiconductors

It has recently been shown that in slightly electron doped WSe2, there are spin correlations which can be stabilized by a circularly polarized optical pump, and measured using a circular dichroism measurement. In this low-doped regime, the electron-electron interactions mediate the formation of correlated phases. Using the circular dichroism, spin-correlations and their dynamics can be measured in optical pump-probe measurements. We study the spatio-temporal variation of these spin-correlations at displacements of several micrometers, demonstrating an amplification of the initial pump-induced spin-polarization by more than an order of magnitude due to magnetic interactions. Understanding of the behavior of spin-correlations in WSe2, and manipulation of spin-amplifcation, forwards efforts in the study of correlated phases in two-dimensional materials and applications in nanophotonics and spintronics.