Enhanced valley splitting of WSe2 in twisted van der Waals WSe2/CrI3 heterostructures

Ge, Mei; Wang, Han; Wu, Jizheng; Si, Chen; Zhang, Junfeng; Zhang, Shengbai

doi:10.1038/s41524-022-00715-9

Title: Enhanced valley splitting of WSe₂ in twisted van der Waals WSe₂/CrI₃ heterostructures

Journal Article · 14 February 2022 · npj Computational Materials

DOI: https://doi.org/10.1038/s41524-022-00715-9 · OSTI ID:1848075

Ge, Mei ^[1]; Wang, Han ^[2]; Wu, Jizheng ^[3]; Si, Chen ^[3];

^[1]; Zhang, Shengbai ^[4]

Shanxi Normal Univ., Taiyuan (China)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Beihang Univ., Beijing (China)
Rensselaer Polytechnic Inst., Troy, NY (United States)

Van der Waals (vdW) heterostructures composed of different two-dimensional (2D) materials offer an easily accessible way to combine properties of individual materials for applications. Owing to the discovery of a set of unanticipated physical phenomena, the twisted 2D vdW heterostructures have gained considerable attention recently. Here, we report enhanced valley splitting in twisted 2D vdW WSe₂/CrI₃ heterostructures. In particular, the splitting can be 1200% (or 5.18 meV) of the value for a non-twisted heterostructure. According to the $k ∙ p$ model, this value is equivalent to a ~20T external magnetic field applied perpendicular to the 2D sheet. The thermodynamic stability of 2D vdW WSe₂/CrI₃ heterostructures, on the other hand, depends linearly on the interlayer twisting angle.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National natural Science Foundation of China

Grant/Contract Number:: AC02-05CH11231; SC0002623

OSTI ID:: 1848075

Journal Information:: npj Computational Materials, Journal Name: npj Computational Materials Journal Issue: 1 Vol. 8; ISSN 2057-3960

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Enhanced valley splitting of WSe₂ in twisted van der Waals WSe₂/CrI₃ heterostructures