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

Nature Materials
Wenjin ZhaoDavid H Cobden

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 materials1-9. The ability to simply stack very different two-dimensional van der Waals materials in intimate contact permits a different approach10,11. Here we use this approach to couple the helical edges states in a two-dimensional topological insulator, monolayer WTe2 (refs. 12-16), to a two-dimensional layered antiferromagnet, CrI3 (ref. 17). 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.

References

Sep 22, 2007·Science·Markus KönigShou-Cheng Zhang
Oct 15, 2008·Physical Review Letters·Chao-Xing LiuShou-Cheng Zhang
May 21, 2013·Physical Review Letters·Peng WeiJagadeesh S Moodera
Mar 29, 2016·Nature Materials·Peng WeiChing-Tzu Chen
Oct 1, 2016·Physical Review Letters·K YasudaY Tokura
Apr 25, 2018·Nature Nanotechnology·Bevin HuangXiaodong Xu
May 8, 2018·Nature Nanotechnology·Shengwei JiangJie Shan
Sep 16, 2018·Nature Communications·Yoshinori Tokura, Naoto Nagaosa
Oct 27, 2018·Science·Ebrahim SajadiDavid H Cobden
Feb 21, 2019·Science Advances·Yanmeng ShiYong-Tao Cui

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Citations

Mar 11, 2020·Nature Materials·Cui-Zu Chang
Apr 25, 2021·Advanced Materials·Michael S LodgeBent Weber
May 29, 2021·Physical Review Letters·Li-Kun ShiJustin C W Song
Jul 21, 2021·Nature Nanotechnology·Juan F SierraSergio O Valenzuela
Jul 13, 2021·The Journal of Physical Chemistry Letters·Zexi LuPeter V Sushko
Sep 24, 2021·Nature Communications·Ran JingD N Basov

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Methods Mentioned

BETA
circular dichroism

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