▎ 摘　　要

Transition metal (TM) trichlorides, with 4d or 5d electrons, are materials at the forefront of recent studies about the interplay of spin-orbit coupling (SOC) and strong Coulomb interactions. Within our first-principles calculations (DFT + U + SOC) we study the effects of graphene on the electronic and magnetic properties of the monolayers (MLs) of alpha-RuCl3 and OsCl3. Despite the spatially inhomogeneous n-type doping induced by graphene, we show that the occupancy of Ru-4d (Os-5d) bands of MLs of alpha-RuCl3(OsCl3) can be tuned through external electric fields and allows the control of (i) metal-insulator transitions and (ii) the magnetic easy-axis and anisotropy energies. Our findings point toward the tuning of electronic and magnetic properties of TM trichloride MLs by using graphene and external electronic fields.