Intrinsic Localized Excitons in MoSe<sub>2</sub>/CrSBr Heterostructure
Despite extensive studies on magnetic proximity effects, the fundamental excitonic properties of the 2D semiconductor-magnet heterostructures remain elusive. Here, the presence of localized excitons in MoSe<sub>2</sub>/CrSBr heterostructures is unveiled, represented by a new photoluminescence emission feature, X<sup>*</sup>. Our findings reveal that X<sup>*</sup> originates from excitons confined by intrinsic defects in the CrSBr layer. Additionally, the degrees of valley polarization of the X<sup>*</sup> and trion peaks exhibit opposite polarities under a magnetic field and closely correlate with the magnetic order of CrSBr. This is attributed to spin-dependent charge transfer across the heterointerface, supported by density functional theory calculations which reveal a type-II band alignment. Furthermore, the strong in-plane anisotropy of CrSBr induces unique polarization-dependent responses in MoSe<sub>2</sub> emissions. This study highlights the crucial role of defects in shaping excitonic properties and offers valuable insights into spectrally resolved proximity effects in semiconductor-magnet van der Waals heterostructures.
Authors
- Pingfan Gu (ORCID: https://orcid.org/0000-0002-4203-794X)
- Yuchen Gao (ORCID: https://orcid.org/0000-0002-3143-4077)
- Zhigang Song (ORCID: https://orcid.org/0000-0002-8355-6498)
- Takashi Taniguchi (ORCID: https://orcid.org/0000-0002-1467-3105)
- Kenji Watanabe (ORCID: https://orcid.org/0000-0003-3701-8119)
- Xinyue Huang (ORCID: https://orcid.org/0000-0002-3447-9369)
- Yu Ye (ORCID: https://orcid.org/0000-0001-6046-063X)
- Zuxin Chen (ORCID: https://orcid.org/0000-0001-7779-2382)
- Shiqi Yang (ORCID: https://orcid.org/0000-0003-3235-8974)
Institutions
- Harvard University (US)
- South China Normal University (CN)
- Peking University (CN)
- National Institute for Materials Science (JP)
- Shenyang Academy of Environmental Sciences (China) (CN)
- State Key Laboratory of Artificial Microstructure and Mesoscopic Physics
- Liaoning Academy of Materials
Publication Details
- Journal
- Advanced Materials
- Published
- 2024-12-18
- DOI
- https://doi.org/10.1002/adma.202413438
- Citations
- 7
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.82
Funders
- Ministry of Education, Culture, Sports, Science and Technology
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Natural Science Foundation of Beijing Municipality
- Japan Society for the Promotion of Science
- National Key Research and Development Program of China