| Full text | |
| Author(s): |
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]
Total Authors: 7
|
| Affiliation: | [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
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW APPLIED; v. 16, n. 6 DEC 23 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 19/23488-5 - 2D devices for optoeletronics |
| Grantee: | Yara Galvão Gobato |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/01808-5 - Optical and Transport Properties in High Magnetic Fields of Semiconductor Heterostructures and Devices based on Two Dimensional Materials |
| Grantee: | Yara Galvão Gobato |
| Support Opportunities: | Scholarships abroad - Research |
| FAPESP's process: | 18/00823-0 - New topological states of matter under extreme conditions |
| Grantee: | Ricardo Donizeth dos Reis |
| Support Opportunities: | Research Grants - Young Investigators Grants |