激子
宽禁带半导体
材料科学
物理
凝聚态物理
原子物理学
光电子学
化学
作者
Camila Cavalini,Cesar Rabahi,Caique Serati de Brito,E. Lee,José Roberto de Toledo,Felipe F. Cazetta,R. Oliveira,Marcelo B. Andrade,M. Henini,Yuhao Zhang,Jeongyong Kim,Ingrid D. Barcelos,Y. Galvão Gobato
摘要
We have investigated the optical and magneto-optical properties of monolayer (ML) WSe2 on flakes of β-Ga2O3 under high magnetic fields. Remarkably, sharp emission peaks were observed and associated with localized excitons related to point defects. A detailed study of low-temperature photoluminescence (PL) and magneto-PL under high perpendicular magnetic field up to 9 T was carried out. Several sharp emission peaks have shown valley g-factors values close to −4, which is an unusual result for localized excitons in WSe2. Furthermore, some PL peaks have shown higher g-factor values of ≈−7 and ≈−12, which were associated with the hybridization of strain localized dark excitons and defects. The reported results suggest that β-Ga2O3 is, indeed, a promising dielectric substrate for ML WSe2 and also to explore fundamental physics in view of possible applications in quantum information technology.
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