Ulstrup, Soren ORCID: 0000-0001-5922-4488, Johannsen, Jens Christian, Cilento, Federico ORCID: 0000-0002-4121-1694, Crepaldi, Alberto ORCID: 0000-0001-9971-1731, Miwa, Jill A., Zacchigna, Michele ORCID: 0000-0002-3785-8823, Cacho, Cephise ORCID: 0000-0002-0058-5817, Chapman, Richard T., Springate, Emma ORCID: 0000-0002-9121-3698, Fromm, Felix, Raidel, Christian, Seyller, Thomas, King, Phil D. C., Parmigiani, Fulvio, Grioni, Marco and Hofmann, Philip ORCID: 0000-0002-7367-5821 (2015). Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene. J. Electron Spectrosc. Relat. Phenom., 200. S. 340 - 347. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1873-2526

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Abstract

In pump-probe time and angle-resolved photoemission spectroscopy (TR-ARPES) experiments the presence of the pump pulse adds a new level of complexity to the photoemission process in comparison to conventional ARPES. This is evidenced by pump-induced vacuum space-charge effects and surface photovoltages, as well as multiple pump excitations due to internal reflections in the sample-substrate system. These processes can severely affect a correct interpretation of the data by masking the out-of-equilibrium electron dynamics intrinsic to the sample. In this study, we show that such effects indeed influence TR-ARPES data of graphene on a silicon carbide (SiC) substrate. In particular, we find a time- and laser fluence-dependent spectral shift and broadening of the acquired spectra, and unambiguously show the presence of a double pump excitation. The dynamics of these effects is slower than the electron dynamics in the graphene sample, thereby permitting us to deconvolve the signals in the time domain. Our results demonstrate that complex pump-related processes should always be considered in the experimental setup and data analysis. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Ulstrup, SorenUNSPECIFIEDorcid.org/0000-0001-5922-4488UNSPECIFIED
Johannsen, Jens ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cilento, FedericoUNSPECIFIEDorcid.org/0000-0002-4121-1694UNSPECIFIED
Crepaldi, AlbertoUNSPECIFIEDorcid.org/0000-0001-9971-1731UNSPECIFIED
Miwa, Jill A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zacchigna, MicheleUNSPECIFIEDorcid.org/0000-0002-3785-8823UNSPECIFIED
Cacho, CephiseUNSPECIFIEDorcid.org/0000-0002-0058-5817UNSPECIFIED
Chapman, Richard T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Springate, EmmaUNSPECIFIEDorcid.org/0000-0002-9121-3698UNSPECIFIED
Fromm, FelixUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Raidel, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seyller, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
King, Phil D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parmigiani, FulvioUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grioni, MarcoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hofmann, PhilipUNSPECIFIEDorcid.org/0000-0002-7367-5821UNSPECIFIED
URN: urn:nbn:de:hbz:38-409096
DOI: 10.1016/j.elspec.2015.04.010
Journal or Publication Title: J. Electron Spectrosc. Relat. Phenom.
Volume: 200
Page Range: S. 340 - 347
Date: 2015
Publisher: ELSEVIER SCIENCE BV
Place of Publication: AMSTERDAM
ISSN: 1873-2526
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CARRIER MULTIPLICATION; SPECTROSCOPY; SURFACEMultiple languages
SpectroscopyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40909

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