Effect of high-optical excitation on the ultrafast electron dynamics in stacked-monolayer graphene samples

Página do item simplificado
dc.contributor.authorCastaneda J.A.
dc.contributor.authorGuimaraes Rosa H.
dc.contributor.authorGomes J.C.V.
dc.contributor.authorDe Souza E.A.T.
dc.contributor.authorDe Brito-Cruz C.H.
dc.contributor.authorFragnito H.L.
dc.contributor.authorPadilha L.A.
dc.date.accessioned2024-03-13T00:55:13Z
dc.date.available2024-03-13T00:55:13Z
dc.date.issued2016
dc.description.abstract© 2016 SPIE.We report on transient absorption experiments performed at high optical excitation fluences and used to study the ultrafast dynamics in graphene. We employed a degenerated scheme of pump and probe at 800 nm (1.55 eV). The time resolution of our measurements was limited by the pulse duration ∼ 100 fs. The samples were prepared by chemical vapor deposition (CVD) as single-layers on silica and, then staked layer-by-layer in order to make a stack of up to 5 graphene monolayers. We observed saturable absorption (SA) and fluence-dependent relaxation times. We see that the ultrafast carrier dynamics is composed by two decay mechanisms, one with response time of about 200 fs and a slower process of about 1 ps. The fast decay, due to both carrier-carrier and carrier-optical phonon scattering, becomes slower when the density of excited carrier was increased. We implemented a theoretical model and found that both the optical phonon rate emission and the optical phonon lifetime are affect by the pump fluence.
dc.description.volume9835
dc.identifier.doi10.1117/12.2235501
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36086
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineering
dc.rightsAcesso Restrito
dc.subject.otherlanguagegraphene
dc.subject.otherlanguagehigh-fluence excitation
dc.subject.otherlanguagesaturation absorption
dc.subject.otherlanguageultrafast spectroscopy
dc.titleEffect of high-optical excitation on the ultrafast electron dynamics in stacked-monolayer graphene samples
dc.typeArtigo de evento
local.scopus.citations0
local.scopus.eid2-s2.0-84983315879
local.scopus.subjectChemical vapor depositions (CVD)
local.scopus.subjectFluences
local.scopus.subjectOptical phonon scattering
local.scopus.subjectSaturable absorption
local.scopus.subjectSaturation absorption
local.scopus.subjectUltra-fast spectroscopies
local.scopus.subjectUltrafast carrier dynamics
local.scopus.subjectUltrafast electron dynamics
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84983315879&origin=inward
Arquivos
Coleções
Artigo de evento