Interfacial Magnetic Order Controls Valley Polarization in WS <sub>2</sub> /Fe <sub>3</sub> GaTe <sub>2</sub> Heterostructures
heterostructures. By comparing bottom- and top-stacked architectures, we disentangle intrinsic magnetic proximity effects from oxidation-driven interfacial reconstruction. The protected bottom-stacked interface preserves ferromagnetic order, yielding pronounced valley hysteresis and a giant valley exciton Zeeman splitting of 13.7 meV, equivalent to an effective magnetic field of ∼59 T. In contrast, the exposed top-stacked interface exhibits only 1.26 meV splitting. Polarization-resolved photoluminescence, high-field magneto-optical measurements, and first-principles calculations reveal that oxidation induces an interfacial transition from ferromagnetic to antiferromagnetic order, suppressing the proximity exchange field through weakened Fe-W orbital hybridization. These results establish interfacial magnetic reconstruction as the key factor governing magneto-valley coupling.
Authors
- Yanping Liu (ORCID: https://orcid.org/0000-0003-2990-3783)
- Xi Zhang (ORCID: https://orcid.org/0000-0002-4638-3997)
- Jian-Tao Wang (ORCID: https://orcid.org/0000-0002-0786-1212)
- J He
- Li S
- Junying Chen
- Zongwen Liu
- Shikun Hou
- Siyu Zhang
- Xing Xie
Institutions
- The University of Sydney (AU)
- Central South University (CN)
- Chinese Academy of Sciences (CN)
- Songshan Lake Materials Laboratory (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- National Laboratory for Superconductivity (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- The Journal of Physical Chemistry Letters
- Published
- 2026-06-12
- DOI
- https://doi.org/10.1021/acs.jpclett.6c01041
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- National Science and Technology Major Project
- Australian Research Council