This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.104.L161104 in citations.
Please use the identifier: http://hdl.handle.net/2128/29739 in citations.
Ultrafast electronic linewidth broadening in the C 1 s core level of graphene
Ultrafast electronic linewidth broadening in the C 1 s core level of graphene
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 electr...
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Personal Name(s): | Curcio, Davide |
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Pakdel, Sahar / Volckaert, Klara / Miwa, Jill A. / Ulstrup, Søren / Lanatà, Nicola / Bianchi, Marco / Kutnyakhov, Dmytro / Pressacco, Federico / Brenner, Günter / Dziarzhytski, Siarhei / Redlin, Harald / Agustsson, Steinn Ymir / Medjanik, Katerina / Vasilyev, Dmitry / Elmers, Hans-Joachim / Schönhense, Gerd / Tusche, Christian / Chen, Ying-Jiun / Speck, Florian / Seyller, Thomas / Bühlmann, Kevin / Gort, Rafael / Diekmann, Florian / Rossnagel, Kai / Acremann, Yves / Demsar, Jure / Wurth, Wilfried / Lizzit, Daniel / Bignardi, Luca / Lacovig, Paolo / Lizzit, Silvano / Sanders, Charlotte E. (Corresponding author) | |
Contributing Institute: |
Elektronische Eigenschaften; PGI-6 |
Published in: | Physical review / B, 104 (2021) 16, S. L161104 |
Imprint: |
Woodbury, NY
Inst.
2021
|
DOI: |
10.1103/PhysRevB.104.L161104 |
Document Type: |
Journal Article |
Research Program: |
Topological Matter |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/29739 in citations.
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. |