Tunable Proximity Valley Splitting Via Interfacial Exchange Pinning in WSe₂-CrBr₃-CrPS₄ Heterostructures.

Authors

Shaofei Li, Xing Xie, Junying Chen, Xian Zhang, Shikun Hou, Siyu Zhang, Jianyi Luo, Jun He, Zongwen Liu, Yanping Liu

Published in

Nano letters. Jul 05, 2026. Epub Jul 05, 2026.

Abstract

Magnetic proximity effects in van der Waals heterostructures provide an optical route to manipulate valley pseudospins in transition-metal dichalcogenides, but abrupt switching of two-dimensional (2D) ferromagnets (FM) limits continuous valley modulation. We demonstrate that the proximity-induced valley response of WSe₂ can be modified by engineering the interfacial magnetic environment in WSe₂-CrBr₃-CrPS₄ heterostructures. Circularly polarized magneto-photoluminescence reveals robust nonvolatile valley polarization in WSe₂-CrBr₃ with a pronounced low-field hysteresis tracking CrBr₃ magnetization. Spectroscopy and calculations indicate that spin-selective interfacial charge transfer and orbital hybridization enhance the proximity exchange field and valley Zeeman splitting. Introducing antiferromagnetic (AFM) CrPS₄ weakens the degree of circular polarization modulation and broadens the low-field valley polarization reversal, consistent with an interfacial AFM/FM exchange pinning scenario. These results show that interfacial magnetic engineering can tailor proximity-induced valley responses in 2D heterostructures.

PMID:
42402031
Bibliographic data and abstract were imported from PubMed on 05 Jul 2026.

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