Giant Valley Zeeman Splitting in Vanadium‐Doped WSe <sub>2</sub> Monolayers
2D dilute magnetic semiconductors (DMS) based on transition metal dichalcogenides (TMD) offer an innovative pathway for advancing spintronic technologies, including the potential to exploit phenomena such as the valley Zeeman effect. However, the impact of magnetic ordering on the valley degeneracy breaking and on the enhancement of the optical transitions g-factors of these materials remains an open question. Here, a giant effective g-factors ranging between ≈-27 and -69 for the bound exciton at 4 K in vanadium-doped WSe<sub>2</sub> monolayers, obtained through magneto-photoluminescence (PL) experiments is reported. This giant g-factor disappears at room temperature, suggesting that this response is associated with a magnetic ordering of the vanadium impurity states at low temperatures. Ab initio calculations for the vanadium-doped WSe<sub>2</sub> monolayer confirm the existence of magnetic ordering of the vanadium states, which leads to degeneracy breaking of the valence bands at K and K'. A phenomenological analysis is employed to correlate this splitting with the measured enhanced effective g-factor. The findings shed light on the potential of defect engineering of 2D materials for spintronic applications.
Authors
- M. A. Pimenta (ORCID: https://orcid.org/0000-0002-3389-0682)
- Mingzu Liu (ORCID: https://orcid.org/0000-0003-3208-6710)
- Da Zhou (ORCID: https://orcid.org/0000-0002-7189-5222)
- Matheus J. S. Matos (ORCID: https://orcid.org/0000-0002-0398-3992)
- Zhuohang Yu (ORCID: https://orcid.org/0000-0003-1593-1054)
- Frederico B. Sousa (ORCID: https://orcid.org/0000-0001-7974-9548)
- Hélio Chacham (ORCID: https://orcid.org/0000-0001-5041-9094)
- Alessandra Ames (ORCID: https://orcid.org/0000-0002-7996-8836)
- Leandro M. Malard (ORCID: https://orcid.org/0000-0003-4207-9653)
- Humberto Terrones (ORCID: https://orcid.org/0000-0003-0515-0721)
- Marcio Daldin Teodoro (ORCID: https://orcid.org/0000-0002-3557-5555)
- Lucas Lafetá (ORCID: https://orcid.org/0000-0002-1594-9142)
- Geovani C. Resende (ORCID: https://orcid.org/0000-0003-4419-9448)
- Bruno R. Carvalho (ORCID: https://orcid.org/0000-0001-5188-8685)
Institutions
- Universidade Federal de Ouro Preto (BR)
- Universidade Federal de Minas Gerais (BR)
- Pennsylvania State University (US)
- Universidade Federal de São Carlos (BR)
- Center for NanoScience (DE)
- Universidade Federal do Rio Grande do Norte (BR)
- Ludwig-Maximilians-Universität München (DE)
Publication Details
- Journal
- Small
- Published
- 2024-10-08
- DOI
- https://doi.org/10.1002/smll.202405434
- Citations
- 7
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.82
Funders
- Alexander von Humboldt-Stiftung
- 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
- Financiadora de Estudos e Projetos
- Instituto Nacional de Ciência e Tecnologia em Nanomateriais de Carbono
- Universidade Federal de Ouro Preto
- Air Force Office of Scientific Research