Probing the Nature of Single-Photon Emitters in a WSe<sub>2</sub> Monolayer by Magneto-Photoluminescence Spectroscopy
Monolayer transition metal dichalcogenides (TMDs) have emerged as promising materials to generate single-photon emitters (SPEs). While there are several previous reports in the literature about TMD-based SPEs, the precise nature of the excitonic states involved in them is still under debate. Here, we use magneto-optical techniques under in-plane and out-of-plane magnetic fields to investigate the nature of SPEs in WSe<sub>2</sub> monolayers on glass substrates under different strain profiles. Our results reveal important changes on the exciton localization and, consequently, on the optical properties of SPEs. Remarkably, we observe an anomalous PL energy redshift with no significant changes of photoluminescence (PL) intensity under an in-plane magnetic field. We present a model to explain this redshift based on intervalley defect excitons under a parallel magnetic field. Overall, our results offer important insights into the nature of SPEs in TMDs, which are valuable for future applications in quantum technologies.
Authors
- Caique Serati de Brito (ORCID: https://orcid.org/0000-0003-3992-1731)
- Ingrid D. Barcelos (ORCID: https://orcid.org/0000-0002-5778-7161)
- Cesar Rabahi (ORCID: https://orcid.org/0000-0002-9054-4997)
- Douglas F. Franco (ORCID: https://orcid.org/0000-0002-6273-8612)
- Bárbara L. T. Rosa (ORCID: https://orcid.org/0000-0001-9433-3532)
- Marcelo Nalin (ORCID: https://orcid.org/0000-0002-7971-6794)
- Stephan Reitzenstein (ORCID: https://orcid.org/0000-0002-1381-9838)
- Andrey Chaves (ORCID: https://orcid.org/0000-0002-7000-3704)
- Y. Galvão Gobato (ORCID: https://orcid.org/0000-0003-2251-0426)
- Camila Cavalini (ORCID: https://orcid.org/0009-0005-1057-0220)
Institutions
- University of Antwerp (BE)
- Universidade Federal de São Carlos (BR)
- Universidade Federal do Ceará (BR)
- Brazilian Synchrotron Light Laboratory (BR)
- Brazilian Center for Research in Energy and Materials (BR)
- Technische Universität Berlin (DE)
- Universidade Estadual Paulista (Unesp) (BR)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-10-10
- DOI
- https://doi.org/10.1021/acs.nanolett.4c03686
- Citations
- 10
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.17
Funders
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico