Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene.

dc.contributor.authorPogna, Eva A. A.
dc.contributor.authorMiao, Xianchong
dc.contributor.authorDreifus, Driele Von
dc.contributor.authorSouza, Thonimar Vieira de Alencar
dc.contributor.authorMoutinho, Marcus Vinicius de Oliveira
dc.contributor.authorVenezuela, Pedro Paulo de Mello
dc.contributor.authorManzoni, Cristian
dc.contributor.authorJi, Minbiao
dc.contributor.authorCerullo, Giulio
dc.contributor.authorPaula, Ana Maria de
dc.date.accessioned2022-03-22T17:17:44Z
dc.date.available2022-03-22T17:17:44Z
dc.date.issued2021pt_BR
dc.description.abstractVan der Waals heterostructures obtained by artificially stacking two-dimensional crystals represent the frontier of material engineering, demonstrating properties superior to those of the starting materials. Fine control of the interlayer twist angle has opened new possibilities for tailoring the optoelectronic properties of these heterostructures. Twisted bilayer graphene with a strong interlayer coupling is a prototype of twisted heterostructure inheriting the intriguing electronic properties of graphene. Understanding the effects of the twist angle on its out-of-equilibrium optical properties is crucial for devising optoelectronic applications. With this aim, we here combine excitation-resolved hot photoluminescence with femtosecond transient absorption microscopy. The hot charge carrier distribution induced by photo-excitation results in peaked absorption bleaching and photo-induced absorption bands, both with pronounced twist angle dependence. Theoretical simulations of the electronic band structure and of the joint density of states enable to assign these bands to the blocking of interband transitions at the van Hove singularities and to photo-activated intersubband transitions. The tens of picoseconds relaxation dynamics of the observed bands is attributed to the angle-dependence of electron and phonon heat capacities of twisted bilayer graphene.pt_BR
dc.identifier.citationPOGNA, E. A. A. et al. Angle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene. Nano Research, v. 14, p. 2797–2804, 2021. Disponível em: <https://link.springer.com/article/10.1007/s12274-021-3288-0>. Acesso em: 25 ago. 2021.pt_BR
dc.identifier.doihttps://doi.org/10.1007/s12274-021-3288-0pt_BR
dc.identifier.issn1998-0000
dc.identifier.urihttp://www.repositorio.ufop.br/jspui/handle/123456789/14713
dc.identifier.uri2https://link.springer.com/article/10.1007/s12274-021-3288-0pt_BR
dc.language.isoen_USpt_BR
dc.rightsrestritopt_BR
dc.subjectTransient absorption microscopypt_BR
dc.subjectHot-photoluminescencept_BR
dc.subjectVan der Waals heterostructurespt_BR
dc.subjectOptoelectronic propertiespt_BR
dc.subjectVan Hove singularitiespt_BR
dc.titleAngle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene.pt_BR
dc.typeArtigo publicado em periodicopt_BR
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