Proximity-magnetized quantum spin Hall insulator: monolayer 1 T’ WTe2/Cr2Ge2Te6

Li, Junxue; Rashetnia, Mina; Lohmann, Mark; Koo, Jahyun; Xu, Youming; Zhang, Xiao; Watanabe, Kenji; Taniguchi, Takashi; Jia, Shuang; Chen, Xi; Yan, Binghai; Cui, Yong-Tao; Shi, Jing

doi:10.1038/s41467-022-32808-w

Title: Proximity-magnetized quantum spin Hall insulator: monolayer 1 T’ WTe2/Cr2Ge2Te6

Journal Article · Thu Sep 01 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-32808-w· OSTI ID:1885089

Li, Junxue; Rashetnia, Mina;

; Koo, Jahyun; Xu, Youming; Zhang, Xiao;

;

; Chen, Xi;

;

Abstract Van der Waals heterostructures offer great versatility to tailor unique interactions at the atomically flat interfaces between dissimilar layered materials and induce novel physical phenomena. By bringing monolayer 1 T’ WTe ₂ , a two-dimensional quantum spin Hall insulator, and few-layer Cr ₂ Ge ₂ Te ₆ , an insulating ferromagnet, into close proximity in an heterostructure, we introduce a ferromagnetic order in the former via the interfacial exchange interaction. The ferromagnetism in WTe ₂ manifests in the anomalous Nernst effect, anomalous Hall effect as well as anisotropic magnetoresistance effect. Using local electrodes, we identify separate transport contributions from the metallic edge and insulating bulk. When driven by an AC current, the second harmonic voltage responses closely resemble the anomalous Nernst responses to AC temperature gradient generated by nonlocal heater, which appear as nonreciprocal signals with respect to the induced magnetization orientation. Our results from different electrodes reveal spin-polarized edge states in the magnetized quantum spin Hall insulator.

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Research Organization:: Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); European Research Council (ERC); MEXT, Japan; Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: FG02-07ER46351; ECCS-2051450; DMR-2004701; 815869; JPMXP0112101001; 19H05790; 20H00354; 21H05233

OSTI ID:: 1885089

Alternate ID(s):: OSTI ID: 1904639

Journal Information:: Nature Communications, Journal Name: Nature Communications Vol. 13 Journal Issue: 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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