Journal Article

FZJ-2021-06147

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ultrafast electronic linewidth broadening in the C 1 s core level of graphene

Curcio, D. ; Pakdel, S. ; Volckaert, K. ; Miwa, J. A. ; Ulstrup, S. ; Lanatà, N. ; Bianchi, M. ; Kutnyakhov, D. ; Pressacco, F. ; Brenner, G. ; Dziarzhytski, S. ; Redlin, H. ; Agustsson, S. Y. ; Medjanik, K. ; Vasilyev, D.FZJ* ; Elmers, H.-J. ; Schönhense, G. ; Tusche, C.FZJ* ; Chen, Y.-J.FZJ* ; Speck, F. ; Seyller, T. ; Bühlmann, K. ; Gort, R. ; Diekmann, F. ; Rossnagel, K. ; Acremann, Y. ; Demsar, J. ; Wurth, W. ; Lizzit, D. ; Bignardi, L. ; Lacovig, P. ; Lizzit, S. ; Sanders, C. E. (Corresponding author)

2021
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/29739  doi:10.1103/PhysRevB.104.L161104

Abstract: 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.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. 5211 - Topological Matter (POF4-521) (POF4-521)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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