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Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene
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dc.contributor.author | Ulstrup, Søren | |
dc.contributor.author | Johannsen, Jens Christian | |
dc.contributor.author | Cilento, Federico | |
dc.contributor.author | Crepaldi, Alberto | |
dc.contributor.author | Miwa, Jill A. | |
dc.contributor.author | Zacchigna, Michele | |
dc.contributor.author | Cacho, Cephise | |
dc.contributor.author | Chapman, Richard T. | |
dc.contributor.author | Springate, Emma | |
dc.contributor.author | Fromm, Felix | |
dc.contributor.author | Raidel, Christian | |
dc.contributor.author | Seyller, Thomas | |
dc.contributor.author | King, Phil D.C. | |
dc.contributor.author | Parmigiani, Fulvio | |
dc.contributor.author | Grioni, Marco | |
dc.contributor.author | Hofmann, Philip | |
dc.date.accessioned | 2016-04-22T23:32:41Z | |
dc.date.available | 2016-04-22T23:32:41Z | |
dc.date.issued | 2015-04 | |
dc.identifier | 183308814 | |
dc.identifier | 41171a0a-4756-4297-b6b5-0d82d67ade19 | |
dc.identifier | 84942297122 | |
dc.identifier | 000362607600030 | |
dc.identifier.citation | Ulstrup , S , Johannsen , J C , Cilento , F , Crepaldi , A , Miwa , J A , Zacchigna , M , Cacho , C , Chapman , R T , Springate , E , Fromm , F , Raidel , C , Seyller , T , King , P D C , Parmigiani , F , Grioni , M & Hofmann , P 2015 , ' Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene ' , Journal of Electron Spectroscopy and Related Phenomena , vol. 200 , pp. 340–346 . https://doi.org/10.1016/j.elspec.2015.04.010 | en |
dc.identifier.issn | 0368-2048 | |
dc.identifier.other | Bibtex: urn:bfcbf65756ba76692f158c95dd040285 | |
dc.identifier.uri | https://hdl.handle.net/10023/8670 | |
dc.description | The authors acknowledge financial support from the VILLUM foundation, The Danish Council for Independent Research / Technology and Production Sciences, the Swiss National Science Foundation (NSF), EPSRC, The Royal Society and the Italian Ministry of University and Research (Grants No. FIRBRBAP045JF2 and No. FIRB-RBAP06AWK3). Access to the Artemis Facility was funded by STFC. Work in Chemnitz was supported by the European Union through the project ConceptGraphene, and by the German Research Foundation in the framework of the SPP 1459 Graphene. | en |
dc.description.abstract | 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. | |
dc.format.extent | 2040578 | |
dc.language.iso | eng | |
dc.relation.ispartof | Journal of Electron Spectroscopy and Related Phenomena | en |
dc.subject | Hot Electrons | en |
dc.subject | Graphene | en |
dc.subject | Time- and Angle-Resolved Photoemission | en |
dc.subject | Space Charge | en |
dc.subject | QC Physics | en |
dc.subject | NDAS | en |
dc.subject.lcc | QC | en |
dc.title | Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene | en |
dc.type | Journal article | en |
dc.contributor.sponsor | The Royal Society | en |
dc.contributor.sponsor | EPSRC | en |
dc.contributor.institution | University of St Andrews. School of Physics and Astronomy | en |
dc.contributor.institution | University of St Andrews. Condensed Matter Physics | en |
dc.identifier.doi | 10.1016/j.elspec.2015.04.010 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2016-04-23 | |
dc.identifier.grantnumber | UF120096 | en |
dc.identifier.grantnumber | EP/I031014/1 | en |
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