Twisted bilayer graphene photoluminescence emission peaks at van Hove singularities

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dc.creatorThonimar Vieira de Alencar Souza
dc.creatorDriele Von Dreifus
dc.creatorMaria Gabriela Cota Moreira
dc.creatorEliel Gomes da Silva Neto
dc.creatorChao-Hui Yeh
dc.creatorPo-Wen Chiu
dc.creatorMarcos Assunção Pimenta
dc.creatorLeandro Malard Moreira
dc.creatorAna Maria de Paula
dc.date.accessioned2023-02-17T13:04:40Z
dc.date.accessioned2025-09-08T23:13:43Z
dc.date.available2023-02-17T13:04:40Z
dc.date.issued2018-04-03
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.identifier.doihttps://doi.org/10.1088/1361-648X/aab64b
dc.identifier.issn1361-648X
dc.identifier.urihttps://hdl.handle.net/1843/50170
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Restrito
dc.subjectGrafeno
dc.subjectFotoluminescência
dc.subject.otherGrafeno
dc.subject.otherFotoluminescência
dc.titleTwisted bilayer graphene photoluminescence emission peaks at van Hove singularities
dc.typeArtigo de periódico
local.citation.epage5
local.citation.spage1
local.citation.volume30
local.description.resumoWe report on photoluminescence emission imaging by femtosecond laser excitation on twisted bilayer graphene samples. The emission images are obtained by tuning the excitation laser energies in the near infrared region. We demonstrate an increase of the photoluminescence emission at excitation energies that depends on the bilayer twist angle. The results show a peak for the light emission when the excitation is in resonance with transitions at the van Hove singularities in the electronic density of states. We measured the photoluminescence excitation peak position and width for samples with various twist angles showing resonances in the energy range of 1.2 to 1.7 eV.
local.identifier.orcidhttps://orcid.org/0000-0001-8983-8413
local.identifier.orcidhttps://orcid.org/0000-0003-3445-0408
local.identifier.orcidhttps://orcid.org/0000-0002-4658-3243
local.identifier.orcidhttps://orcid.org/0000-0002-9437-055X
local.identifier.orcidhttps://orcid.org/0000-0003-4909-0310
local.identifier.orcidhttps://orcid.org/0000-0002-3389-0682
local.identifier.orcidhttps://orcid.org/0000-0002-8551-5948
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://iopscience.iop.org/article/10.1088/1361-648X/aab64b

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