Interlayer donor-acceptor pair excitons in MoSe(2)/WSe(2) moiré heterobilayer

Localized interlayer excitons (LIXs) in two-dimensional moiré superlattices exhibit sharp and dense emission peaks, making them promising as highly tunable single-photon sources. However, the fundamental nature of these LIXs is still elusive. Here, we show the donor-acceptor pair (DAP) mechanism as...

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Detalles Bibliográficos
Autores principales: Cai, Hongbing, Rasmita, Abdullah, Tan, Qinghai, Lai, Jia-Min, He, Ruihua, Cai, Xiangbin, Zhao, Yan, Chen, Disheng, Wang, Naizhou, Mu, Zhao, Huang, Zumeng, Zhang, Zhaowei, Eng, John J. H., Liu, Yuanda, She, Yongzhi, Pan, Nan, Miao, Yansong, Wang, Xiaoping, Liu, Xiaogang, Zhang, Jun, Gao, Weibo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10507070/
https://www.ncbi.nlm.nih.gov/pubmed/37723156
http://dx.doi.org/10.1038/s41467-023-41330-6
Descripción
Sumario:Localized interlayer excitons (LIXs) in two-dimensional moiré superlattices exhibit sharp and dense emission peaks, making them promising as highly tunable single-photon sources. However, the fundamental nature of these LIXs is still elusive. Here, we show the donor-acceptor pair (DAP) mechanism as one of the origins of these excitonic peaks. Numerical simulation results of the DAP model agree with the experimental photoluminescence spectra of LIX in the moiré MoSe(2)/WSe(2) heterobilayer. In particular, we find that the emission energy-lifetime correlation and the nonmonotonic power dependence of the lifetime agree well with the DAP IX model. Our results provide insight into the physical mechanism of LIX formation in moiré heterostructures and pave new directions for engineering interlayer exciton properties in moiré superlattices.

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