Microscopic View on the Ultrafast Photoluminescence
from Photoexcited Graphene
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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