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PreprintarXiv licencearXiv

Magnetic proximity beyond the interface: Layer-sequence-dependent exchange in WSe2/CrI3 heterostructures

  • Natalie Kuhn
  • Marc Schütte
  • Joachim Emming
  • Felix Hellenkamp
  • Leo Dreyer
  • Frank Volmer
  • Kenji Watanabe
  • Takashi Taniguchi
  • Lutz Waldecker
  • Christoph Stampfer
  • Bernd Beschoten
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Abstract

Magnetic proximity effects in transition metal dichalcogenide (TMD)/2D-magnet heterostructures are often described in terms of the magnetization of the interfacial magnetic layer. Here, we show that this picture is sufficient to describe the neutral-exciton valley splitting of the TMD, but incomplete for its hole-doped electronic structure. We study a gate-tunable van der Waals heterostructure composed of monolayer WSe2 in direct contact with trilayer CrI3. By combining spatially and helicity-resolved reflection-contrast spectroscopy with magnetic circular dichroism, we identify two distinct magnetic domains in the trilayer CrI3: one with purely antiferromagnetic interlayer coupling and one with a mixed antiferromagnetic (AFM)/ferromagnetic~(FM) coupling. In both domains, the sign of the neutral-exciton valley splitting of WSe2 switches with the magnetization reversal of the adjacent CrI3 layer. In contrast, helicity-resolved positive-trion spectroscopy of WSe2 reveals a qualitatively different response. While the AFM domain shows a strongly helicity-selective trion resonance, the mixed AFM/FM domain exhibits trion resonances in both helicities. This behavior disappears when all CrI3 layers are aligned in a parallel magnetization direction. Our results demonstrate that charged excitons are sensitive to the full layer-resolved magnetic sequence of the adjacent 2D-magnet, revealing magnetic proximity beyond the interface.

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Cite

BibTeXRIS
BibTeX
@misc{kuhn2026magnetic,
  title = {{Magnetic proximity beyond the interface: Layer-sequence-dependent exchange in WSe$_2$/CrI$_3$ heterostructures}},
  author = {Natalie Kuhn and Marc Schütte and Joachim Emming and Felix Hellenkamp and Leo Dreyer and Frank Volmer and Kenji Watanabe and Takashi Taniguchi and Lutz Waldecker and Christoph Stampfer and Bernd Beschoten},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.19582},
  eprint = {2610.19582},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.19582},
}
RIS
TY  - UNPB
TI  - Magnetic proximity beyond the interface: Layer-sequence-dependent exchange in WSe_2/CrI_3 heterostructures
AU  - Natalie Kuhn
AU  - Marc Schütte
AU  - Joachim Emming
AU  - Felix Hellenkamp
AU  - Leo Dreyer
AU  - Frank Volmer
AU  - Kenji Watanabe
AU  - Takashi Taniguchi
AU  - Lutz Waldecker
AU  - Christoph Stampfer
AU  - Bernd Beschoten
PY  - 2026
DA  - 2026/10/14
PB  - arXiv
DO  - 10.48550/arxiv.2610.19582
UR  - https://arxiv.org/abs/2610.19582
AB  - Magnetic proximity effects in transition metal dichalcogenide (TMD)/2D-magnet heterostructures are often described in terms of the magnetization of the interfacial magnetic layer. Here, we show that this picture is sufficient to describe the neutral-exciton valley splitting of the TMD, but incomplete for its hole-doped electronic structure. We study a gate-tunable van der Waals heterostructure composed of monolayer WSe_2 in direct contact with trilayer CrI_3. By combining spatially and helicity-resolved reflection-contrast spectroscopy with magnetic circular dichroism, we identify two distinct magnetic domains in the trilayer CrI_3: one with purely antiferromagnetic interlayer coupling and one with a mixed antiferromagnetic (AFM)/ferromagnetic~(FM) coupling. In both domains, the sign of the neutral-exciton valley splitting of WSe_2 switches with the magnetization reversal of the adjacent CrI_3 layer. In contrast, helicity-resolved positive-trion spectroscopy of WSe_2 reveals a qualitatively different response. While the AFM domain shows a strongly helicity-selective trion resonance, the mixed AFM/FM domain exhibits trion resonances in both helicities. This behavior disappears when all CrI_3 layers are aligned in a parallel magnetization direction. Our results demonstrate that charged excitons are sensitive to the full layer-resolved magnetic sequence of the adjacent 2D-magnet, revealing magnetic proximity beyond the interface.
ER  -