http://www.cnr.it/ontology/cnr/individuo/prodotto/ID241084

Ultrafast collinear scattering and carrier multiplication in graphene (Articolo in rivista)

Type

Label

Ultrafast collinear scattering and carrier multiplication in graphene (Articolo in rivista) (literal)

Anno

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Alternative label

Brida, D; Tomadin, A; Manzoni, C; Kim, Y J; Lombardo, A; Milana, S; Nair, R R; Novoselov, K S; Ferrari, A C; Cerullo, G; Polini, M (2013)
Ultrafast collinear scattering and carrier multiplication in graphene
in Nature communications
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Brida, D; Tomadin, A; Manzoni, C; Kim, Y J; Lombardo, A; Milana, S; Nair, R R; Novoselov, K S; Ferrari, A C; Cerullo, G; Polini, M (literal)

Pagina inizio

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http://www.nature.com/ncomms/2013/130617/ncomms2987/full/ncomms2987.html (literal)

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Rivista

Note

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D. Brida, C. Manzoni & G. Cerullo: IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, P.za Leonardo da Vinci, 20133 Milano, Italy A. Tomadin & M. Polini: NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56126 Pisa, Italy Y. J. Kim, R. R. Nair & K. S. Novoselov: Department of Physics and Astronomy, University of Manchester, Manchester M13 9 PL, UK A. Lombardo, S. Milana & A. C. Ferrari: Cambridge Graphene Centre, Cambridge University, 9 JJ Thomson Avenue, Cambridge CB3 OFA, UK D. Brida Present address: Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457 Konstanz, Germany (literal)

Titolo

Abstract

Graphene is emerging as a viable alternative to conventional optoelectronic, plasmonic and nanophotonic materials. The interaction of light with charge carriers creates an out-of-equilibrium distribution, which relaxes on an ultrafast timescale to a hot Fermi-Dirac distribution, that subsequently cools emitting phonons. Although the slower relaxation mechanisms have been extensively investigated, the initial stages still pose a challenge. Experimentally, they defy the resolution of most pump-probe setups, due to the extremely fast sub-100fs carrier dynamics. Theoretically, massless Dirac fermions represent a novel many-body problem, fundamentally different from Schrodinger fermions. Here we combine pump-probe spectroscopy with a microscopic theory to investigate electron-electron interactions during the early stages of relaxation. We identify the mechanisms controlling the ultrafast dynamics, in particular the role of collinear scattering. This gives rise to Auger processes, including charge multiplication, which is key in photovoltage generation and photodetectors. (literal)

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