Ultrafast collinear scattering and carrier multiplication in graphene

Brida, Daniele and Tomadin, Andrea and Manzoni, C. and Kim, Y.J. and Lombardo, A. and Milana, S. and Nair, R. R. and Novoselov, Kostya S. and Ferrari, Andrea C. and Cerullo, Giulio and Polini, Marco (2013) Ultrafast collinear scattering and carrier multiplication in graphene. Nature Communications, 4. ISSN 2041-1723

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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-100 fs carrier dynamics. Theoretically, massless Dirac fermions represent a novel many-body problem, fundamentally different from Schrödinger 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.

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Journal Article
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Nature Communications
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22 Nov 2018 10:06
Last Modified:
22 Nov 2022 06:42