Aarhus University Seal / Aarhus Universitets segl

Philip Hofmann

Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Standard

Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene. / Ulstrup, Søren; Johannsen, Jens Christian; Cilento, Federico; Crepaldi, Alberto; Miwa, Jill A.; Zacchigna, Michele; Cacho, Cephise; Chapman, Richard T.; Springate, Emma; Fromm, Felix; Raidel, Christian; Seyller, Thomas; King, Phil D. C.; Parmigiani, Fulvio; Grioni, Marco; Hofmann, Philip.

I: Journal of Electron Spectroscopy and Related Phenomena, Bind 200, 04.2015, s. 340-346.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Ulstrup, S, Johannsen, JC, Cilento, F, Crepaldi, A, Miwa, JA, Zacchigna, M, Cacho, C, Chapman, RT, Springate, E, Fromm, F, Raidel, C, Seyller, T, King, PDC, 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, bind 200, s. 340-346. https://doi.org/10.1016/j.elspec.2015.04.010

APA

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, 200, 340-346. https://doi.org/10.1016/j.elspec.2015.04.010

CBE

Ulstrup S, Johannsen JC, Cilento F, Crepaldi A, Miwa JA, Zacchigna M, Cacho C, Chapman RT, Springate E, Fromm F, Raidel C, Seyller T, King PDC, 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. 200:340-346. https://doi.org/10.1016/j.elspec.2015.04.010

MLA

Vancouver

Ulstrup S, Johannsen JC, Cilento F, Crepaldi A, Miwa JA, Zacchigna M o.a. Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene. Journal of Electron Spectroscopy and Related Phenomena. 2015 apr;200:340-346. https://doi.org/10.1016/j.elspec.2015.04.010

Author

Ulstrup, Søren ; Johannsen, Jens Christian ; Cilento, Federico ; Crepaldi, Alberto ; Miwa, Jill A. ; Zacchigna, Michele ; Cacho, Cephise ; Chapman, Richard T. ; Springate, Emma ; Fromm, Felix ; Raidel, Christian ; Seyller, Thomas ; King, Phil D. C. ; Parmigiani, Fulvio ; Grioni, Marco ; Hofmann, Philip. / Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene. I: Journal of Electron Spectroscopy and Related Phenomena. 2015 ; Bind 200. s. 340-346.

Bibtex

@article{7e225074b7f24638a5990f467e1ea7f8,
title = "Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene",
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.",
keywords = "Graphene, Time- and angle-resolved photoemission, Space charge, Hot electrons, CARRIER MULTIPLICATION, SPECTROSCOPY, SURFACE",
author = "S{\o}ren Ulstrup and Johannsen, {Jens Christian} and Federico Cilento and Alberto Crepaldi and Miwa, {Jill A.} and Michele Zacchigna and Cephise Cacho and Chapman, {Richard T.} and Emma Springate and Felix Fromm and Christian Raidel and Thomas Seyller and King, {Phil D. C.} and Fulvio Parmigiani and Marco Grioni and Philip Hofmann",
year = "2015",
month = apr,
doi = "10.1016/j.elspec.2015.04.010",
language = "English",
volume = "200",
pages = "340--346",
journal = "Journal of Electron Spectroscopy and Related Phenomena",
issn = "0368-2048",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene

AU - Ulstrup, Søren

AU - Johannsen, Jens Christian

AU - Cilento, Federico

AU - Crepaldi, Alberto

AU - Miwa, Jill A.

AU - Zacchigna, Michele

AU - Cacho, Cephise

AU - Chapman, Richard T.

AU - Springate, Emma

AU - Fromm, Felix

AU - Raidel, Christian

AU - Seyller, Thomas

AU - King, Phil D. C.

AU - Parmigiani, Fulvio

AU - Grioni, Marco

AU - Hofmann, Philip

PY - 2015/4

Y1 - 2015/4

N2 - 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.

AB - 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.

KW - Graphene

KW - Time- and angle-resolved photoemission

KW - Space charge

KW - Hot electrons

KW - CARRIER MULTIPLICATION

KW - SPECTROSCOPY

KW - SURFACE

U2 - 10.1016/j.elspec.2015.04.010

DO - 10.1016/j.elspec.2015.04.010

M3 - Journal article

VL - 200

SP - 340

EP - 346

JO - Journal of Electron Spectroscopy and Related Phenomena

JF - Journal of Electron Spectroscopy and Related Phenomena

SN - 0368-2048

ER -