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The integration of diverse electronic phenomena, such as magnetism andnontrivial topology, into a single system is normally studied either by seekingmaterials that contain both ingredients, or by layered growth of contrastingmaterials. The ability to simply stack very different two dimensional (2D) vander Waals materials in intimate contact permits a different approach. Here weuse this approach to couple the helical edges states in a 2D topologicalinsulator, monolayer WTe2, to a 2D layered antiferromagnet, CrI3. We find thatthe edge conductance is sensitive to the magnetization state of the CrI3, andthe coupling can be understood in terms of an exchange field from the nearestand next-nearest CrI3 layers that produces a gap in the helical edge. We alsofind that the nonlinear edge conductance depends on the magnetization of thenearest CrI3 layer relative to the current direction. At low temperatures thisproduces an extraordinarily large nonreciprocal current that is switched bychanging the antiferromagnetic state of the CrI3.

Magnetic proximity and nonreciprocal current switching in a monolayer WTe2 helical edge