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

Zhao, Wenjin; Fei, Zaiyao; Song, Tiancheng; Choi, Han Kyou; Palomaki, Tauno; Sun, Bosong; Malinowski, Paul; McGuire, Michael A.; Chu, Jiun-Haw; Xu, Xiaodong; Cobden, David H.

doi:10.1038/s41563-020-0620-0

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

Journal Article · Mon Mar 09 04:00:00 EDT 2020 · Nature Materials

DOI:https://doi.org/10.1038/s41563-020-0620-0· OSTI ID:1649052

Zhao, Wenjin ^[1]; ^[1]; ^[1]; Choi, Han Kyou ^[1]; Palomaki, Tauno ^[1]; Sun, Bosong ^[1]; Malinowski, Paul ^[1]; ^[2]; Chu, Jiun-Haw ^[1]; ^[1]; ^[1]

Univ. of Washington, Seattle, WA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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 van der Waals materials in intimate contact permits a different approach. Here we use this approach to couple the helical edges states in a two-dimensional topological insulator, monolayer WTe₂, to a two-dimensional 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649052

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 5 Vol. 19; ISSN 1476-1122

Publisher:: Springer Nature - Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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