| Texto completo | |
| Autor(es): |
Prando, Gabriela Augusta
[1]
;
Severijnen, Marion E.
[2, 3]
;
Barcelos, Ingrid D.
[4]
;
Zeitler, Uli
[2, 3]
;
Christianen, Peter C. M.
[2, 3]
;
Withers, Freddie
[5]
;
Gobato, Yara Galvao
[3, 1]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Phys Dept, Sao Carlos - Brazil
[2] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen - Netherlands
[3] Radboud Univ Nijmegen, High Field Magnet Lab HFML EMFL, NL-6525 ED Nijmegen - Netherlands
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil
[5] Univ Exeter, Coll Engn Math & Phys Sci, Exeter EX4 4QF, Devon - England
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW APPLIED; v. 16, n. 6 DEC 23 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
We report on a detailed study of low-temperature photoluminescence (PL) and magnetophotoluminescence under perpendicular magnetic fields (up to 30 T) and circularly polarized excitation on high-quality monolayer (ML) WS2 on a thick layer (120 nm) of talc dielectric. Remarkably, we obtained high-quality samples without any evidence of localized exciton emission at low temperature and a PL linewidth comparable to that of WS2/h-BN samples. As a consequence, we observe well-resolved emission peaks at low temperature due to the formation of excitonic complexes, including a dark-trion (DT) state and phonon replicas of the DT without the application of an in-plane magnetic field. The nature of the emission peaks, the magnetic field dependence of the degree of polarization, and g factors are discussed in detail and compared with the corresponding results obtained for h-BN encapsulated transition-metal dichalcogenide (TMD) samples. We observe that under sigma(+)-polarized excitation the sign of the circular polarization of biexcitons is reversed under higher magnetic fields. In addition, the dark-trion polarization increases considerably with increasing perpendicular magnetic field, demonstrating different behavior compared with previous studies of dark trions on monolayer WSe2. Our results suggest that talc is indeed a promising layered material for the surface protection of ML TMDs and to explore fundamental physics in view of applications in optoelectronic devices. (AU) | |
| Processo FAPESP: | 19/23488-5 - Dispositivos optoeletrônicos baseados em semicondutores bidimensionais |
| Beneficiário: | Yara Galvão Gobato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/01808-5 - Propriedades ópticas e de transporte em altos campos magnéticos de heteroestruturas e dispositivos semicondutores baseados em materiais bidimensionais (2d) |
| Beneficiário: | Yara Galvão Gobato |
| Modalidade de apoio: | Bolsas no Exterior - Pesquisa |
| Processo FAPESP: | 18/00823-0 - Novos estados topológicos da matéria sob condições extremas |
| Beneficiário: | Ricardo Donizeth dos Reis |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |