Multi-layered heterostructures properties and single-photon sources based on 2D semiconducting materials
Seminário DFMT com Bárbara Rosa (UNICAMP)
11/11, 2ª feira, 16h. No Ed. Alessandro Volta (Bloco C), sala de seminários José Roberto Leite
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Semiconducting van der Waals (vdW) systems have recently emerged as a powerful platform for exploring novel effects of light-matter interaction. Amongst the broad suitability of those systems, we highlight two distinct but equally relevant topics for the 2D materials community: the study and manipulation of excitonic properties in twisted Transition metal dichalcogenides (TMDC) multi-layered heterostructures (HS) [1] and the search for high-quality single-photon emitters (SPEs) [2].
This presentation introduces the studies on exciton complexes in twisted vdW heterostructures composed of stacked MoSe₂ and WSe₂ monolayers. Although these structures host spatially indirect interlayer excitons (IX) with unique twist-angle dependent properties, the applications of IXs are limited by their weak oscillator strength, which leads to a significant reduction in emission. To address it, we explore concepts to manipulate and enhance the emission of excitons in twisted TMDC HSs, such as electrostatic doping manipulation and engineering of multi-stacked TMDC layers [3,4,5]. Additionally, we investigate the light-matter interaction of TMDC HSs integrated into chirped distributed Bragg reflectors to achieve cavity-coupled emission of intra and interlayer excitons, even at room temperature [6] environment conditions. Lastly, the prospects and challenges of 2D material-based single-photon emitters will be briefly introduced here. Although this topic has been extensively covered in the literature, we focus on deepening into fabrication improvements to achieve high-quality TMDC single-photon sources. Overall, we address our efforts to investigate the substrate-dependence emission and quantum coherence properties of WSe2 non-classical light [7,8].
*A pesquisadora se apresenta a convite do Prof. Felix Hernández
[1] M. Förg et al Nat Commun 12, 1656 (2021).
[2] M. Esmann, S. C. Wein and C. Antón-Solanas Adv. Funct. Mater. 34, 2315936 (2024).
[3] B. Rosa, et al arXiv:2407.08063 (2024).
[4] C. C. Palekar et al 2D Mater. 11 025034 (2024).
[5] C. C. Palekar et al - npj 2D Mater Appl 8, 49 (2024).
[6] C. C. Palekar et al Adv. Mater. 36, 2402624 (2024).
[7] M. von Helversen et al 2D Mater. 10 045034 (2023).
[8] C. S. de Brito et al Nano Letters (2024) DOI: 10.1021/acs.nanolett.4c03686.
Data do Evento:
11/11/2024 - 16:00
Data de Término:
11/11/2024 - 17:30