TY  - JOUR
AU  - Curcio, Davide
AU  - Pakdel, Sahar
AU  - Volckaert, Klara
AU  - Miwa, Jill A.
AU  - Ulstrup, Søren
AU  - Lanatà, Nicola
AU  - Bianchi, Marco
AU  - Kutnyakhov, Dmytro
AU  - Pressacco, Federico
AU  - Brenner, Günter
AU  - Dziarzhytski, Siarhei
AU  - Redlin, Harald
AU  - Agustsson, Steinn Ymir
AU  - Medjanik, Katerina
AU  - Vasilyev, Dmitry
AU  - Elmers, Hans-Joachim
AU  - Schönhense, Gerd
AU  - Tusche, Christian
AU  - Chen, Ying-Jiun
AU  - Speck, Florian
AU  - Seyller, Thomas
AU  - Bühlmann, Kevin
AU  - Gort, Rafael
AU  - Diekmann, Florian
AU  - Rossnagel, Kai
AU  - Acremann, Yves
AU  - Demsar, Jure
AU  - Wurth, Wilfried
AU  - Lizzit, Daniel
AU  - Bignardi, Luca
AU  - Lacovig, Paolo
AU  - Lizzit, Silvano
AU  - Sanders, Charlotte E.
TI  - Ultrafast electronic linewidth broadening in the C 1 s core level of graphene
JO  - Physical review / B
VL  - 104
IS  - 16
SN  - 1098-0121
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2021-06147
SP  - L161104
PY  - 2021
AB  - We show that the presence of a transiently excited hot electron gas in graphene leads to a substantial broadening of the C 1s line probed by time-resolved x-ray photoemission spectroscopy. The broadening is found to be caused by an exchange of energy and momentum between the photoemitted core electron and the hot electron gas, rather than by vibrational excitations. This interpretation is supported by a quantitative line-shape analysis that accounts for the presence of the excited electrons. Fitting the spectra to this model directly yields the electronic temperature of the system, in good agreement with electronic temperature values obtained from valence band data. Furthermore, we show how the momentum change of the outgoing core electrons leads to a detectable but very small change in the time-resolved photoelectron diffraction pattern and to a nearly complete elimination of the core level binding energy variation associated with the presence of a narrow σ band in the C 1s state.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000705624300002
DO  - DOI:10.1103/PhysRevB.104.L161104
UR  - https://juser.fz-juelich.de/record/904577
ER  -