Supercollision cooling effects on the hot photoluminescence emission of graphene

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dc.creatorThonimar Vieira de Alencar Souza
dc.creatorLeandro Malard Moreira
dc.creatorAna Maria de Paula
dc.date.accessioned2023-02-16T18:40:52Z
dc.date.accessioned2025-09-08T23:45:23Z
dc.date.available2023-02-16T18:40:52Z
dc.date.issued2016-09-30
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/10.1088/0957-4484/27/44/445710
dc.identifier.issn1361-6528
dc.identifier.urihttps://hdl.handle.net/1843/50151
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.rightsAcesso Restrito
dc.subjectFotoluminescência
dc.subjectGrafeno
dc.subject.otherFotoluminescência
dc.subject.otherGrafeno
dc.titleSupercollision cooling effects on the hot photoluminescence emission of graphene
dc.typeArtigo de periódico
local.citation.epage6
local.citation.issue44
local.citation.spage1
local.citation.volume27
local.description.resumoWe report on hot photoluminescence measurements that show the effects of acoustic phonon supercollision processes in the intensity of graphene light emission. We use a simple optical method to induce defects on single layer graphene in a controlled manner to study in detail the light emission dependence on the sample defect density. It is now well accepted that the graphene photoluminescence is due to black-body thermal emission from the quasi-equilibrium electrons at a temperature well above the lattice temperature. Our results show that as the sample defect density is increased the electrons relax energy more efficiently via acoustic phonon supercollision processes leading to lower electron temperatures and thus lower emission intensities. The calculated intensity decrease due to supercollision energy relaxation agrees well with the experimental data.
local.identifier.orcidhttps://orcid.org/0000-0001-8983-8413
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/10.1088/0957-4484/27/44/445710

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