Optically controllable magnetism in atomically thin semiconductors.

ABSTRACT: We report evidence that ferromagnetic order in electrostatically doped, monolayer transition metal dichalcogenide (TMD) semiconductors can be stabilized and controlled at zero magnetic field by local optical pumping. We use circular dichroism (CD) in reflectivity from excitonic states as a spatially resolved probe of charge-carrier spin polarization. At electron densities n_e ~ 10¹² cm^-2, a diffraction-limited, circularly polarized optical pump breaks symmetry between oppositely polarized magnetic states and stabilizes long-range magnetic order, with carrier polarization exceeding 80% over an 8 μm by 5 μm extent. In time-resolved measurements with pulsed optical excitation, we observe that magnetic interactions amplify the initial pump-induced spin po

SUBMITTER: Hao K 

PROVIDER: S-EPMC9524837 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature