title: Microscopic view on the ultrafast photoluminescence from photoexcited graphene.
abstract: We present a joint theory-experiment study on ultrafast photoluminescence from photoexcited graphene. On the basis of a microscopic theory, we reveal two distinct mechanisms behind the occurring photoluminescence: besides the well-known incoherent contribution driven by nonequilibrium carrier occupations, we found a coherent part that spectrally shifts with the excitation energy. In our experiments, we demonstrate for the first time the predicted appearance and spectral shift of the coherent photoluminescence.
authors.affiliation: Institut für Theoretische Physik, Technische Universität Berlin , Hardenbergstraße 36, 10623 Berlin, Germany.
authors.forename: Torben
authors.initials: T
authors.lastname: Winzer
authors.forename: Richard
authors.initials: R
authors.lastname: Ciesielski
authors.forename: Matthias
authors.initials: M
authors.lastname: Handloser
authors.forename: Alberto
authors.initials: A
authors.lastname: Comin
authors.forename: Achim
authors.initials: A
authors.lastname: Hartschuh
authors.forename: Ermin
authors.initials: E
authors.lastname: Malic
keywords: carrier dynamics; carrier-phonon scattering; carrier−carrier scattering; coherent and incoherent photoluminescence; graphene