  Using symmetry arguments and a tight-binding model, we show that for layered
collinear anti- ferromagnets, magneto-optic effects can be generated and
manipulated by controlling crystal symmetries through a gate voltage. This
provides a promising route for electric field manipulation of the magneto-optic
effects without modifying the underlying magnetic structure. We further
demonstrate the gate control of magneto-optic Kerr effect (MOKE) in bilayer
MnPSe3 using first-principles calculations. The field-induced inversion
symmetry breaking effect leads to gate-controllable MOKE whose direction of
rotation can be switched by the reversal of the gate voltage.
