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"Microscopic View on the Ultrafast Photoluminescence from Photoexcited Graphene" Torben Winzer, Richard Ciesielski, Matthias Handloser, Alberto Comin, Achim Hartschuh, and Ermin MalicNano Lett. 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. This publication has not been written at BMO BMO authors (in alphabetic order): Richard Ciesielski  WWW-Version DOI-Version |