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

Abstract

The integration of diverse electronic phenomena, such as magnetism and nontrivial topology, into a single system is normally studied either by seeking materials that contain both ingredients, or by layered growth of contrasting materials. The ability to simply stack very different two dimensional (2D) van der Waals materials in intimate contact permits a different approach. Here we use this approach to couple the helical edges states in a 2D topological insulator, monolayer WTe2, to a 2D layered antiferromagnet, CrI3. We find that the edge conductance is sensitive to the magnetization state of the CrI3, and the coupling can be understood in terms of an exchange field from the nearest and next-nearest CrI3 layers that produces a gap in the helical edge. We also find that the nonlinear edge conductance depends on the magnetization of the nearest CrI3 layer relative to the current direction. At low temperatures this produces an extraordinarily large nonreciprocal current that is switched by changing the antiferromagnetic state of the CrI3.

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Cited by in corpus (18)

• Van der Waals heterostructures for spintronics and opto-spintronics
• Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
• Unification of Nonlinear Anomalous Hall Effect and Nonreciprocal Magnetoresistance in Metals by the Quantum Geometry
• Two-Dimensional Materials for Energy-Efficient Spin-Orbit Torque Devices
• Atomically Thin Quantum Spin Hall Insulators
• Geometric photon-drag effect and nonlinear shift current in centrosymmetric crystals
• Chirality induced Giant Unidirectional Magnetoresistance in Twisted Bilayer Graphene
• Determination of the spin axis in quantum spin Hall insulator monolayer WTe2
• Electronic band structure changes across the antiferromagnetic phase transition of exfoliated MnPS${}_3$ probed by $\mu$-ARPES
• Transport measurements on van der Waals heterostructures under pressure
• An antiferromagnetic diode effect in even-layered MnBi2Te4
• Elucidating proximity magnetism through polarized neutron reflectometry and machine learning
• Physical Vapor Transport Growth of Antiferromagnetic CrCl${}_3$ Flakes Down to Monolayer Thickness
• Gate-defined Josephson weak-links in monolayer $\mathrm{WT}{\mathrm{e}}_2$
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Reversible edge spin currents in antiferromagnetically proximitized dichalcogenides
• Gate control of 2D magnetism in tri- and four-layers $\mathrm{Cr}{\mathrm{I}}_3$/graphene heterostructures
• Unidirectional magneto-transport of linearly dispersing topological edge states