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

Página do item simplificado
dc.creatorEva Arianna Aurelia Pogna
dc.creatorAna Maria de Paula
dc.creatorXianchong Miao
dc.creatorDriele Von Dreifus
dc.creatorThonimar Vieira de Alencar Souza
dc.creatorMarcus Vinicius de Oliveira Moutinho
dc.creatorPedro Paulo de Mello Venezuela
dc.creatorCristian Manzoni
dc.creatorMinbiao Ji
dc.creatorGiulio Cerullo
dc.date.accessioned2023-07-10T18:12:24Z
dc.date.accessioned2025-09-08T23:20:32Z
dc.date.available2023-07-10T18:12:24Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.description.sponsorshipFAPERJ - Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
dc.format.mimetypepdf
dc.identifier.doihttps://doi.org/10.1007/s12274-021-3288-0
dc.identifier.issn19980000
dc.identifier.urihttps://hdl.handle.net/1843/56027
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofNano Research
dc.rightsAcesso Aberto
dc.subjectGrafeno
dc.subjectMicroscopia
dc.subjectFotoluminescência
dc.subjectEspectroscopia óptica
dc.subject.otherTwisted bilayer graphene
dc.subject.otherTransient absorption microscopy
dc.subject.otherHot-photoluminescence
dc.subject.otherVan der Waals heterostructures
dc.subject.otherOptoelectronic properties
dc.subject.otherVan Hove singularities
dc.titleAngle-tunable intersubband photoabsorption and enhanced photobleaching in twisted bilayer graphene
dc.typeArtigo de periódico
local.citation.epage2804
local.citation.issue8
local.citation.spage2797
local.citation.volume14
local.description.resumoVan 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.
local.identifier.orcidhttps://orcid.org/0000-0003-4779-3549
local.identifier.orcidhttps://orcid.org/0000-0002-8551-5948
local.identifier.orcidhttps://orcid.org/0000-0003-3445-0408
local.identifier.orcidhttps://orcid.org/0000-0001-8983-8413
local.identifier.orcidhttps://orcid.org/0000-0003-0356-607X
local.identifier.orcidhttps://orcid.org/0000-0002-4166-2487
local.identifier.orcidhttps://orcid.org/0000-0002-4169-8869
local.identifier.orcidhttps://orcid.org/0000-0002-9066-4008
local.identifier.orcidhttps://orcid.org/0000-0002-9534-2702
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://link.springer.com/article/10.1007/s12274-021-3288-0#citeas

Arquivos

Pacote original

Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
Angle-tunable intersubband photoabsorption and enhanced.pdf
Tamanho:
640.6 KB
Formato:
Adobe Portable Document Format
Baixar

Licença do pacote

Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
License.txt
Tamanho:
1.99 KB
Formato:
Plain Text
Descrição:
Baixar

Coleções

Artigo de Periódico

Logo UFMG