Time-resolved HAXPES using a microfocused XFEL beam: From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics

Lars Philip Oloff, Ashish Atma Chainani, Masaharu Matsunami, Kazutoshi Takahashi, Tadashi Togashi, Hitoshi Osawa, Kerstin Hanff, Arndt Quer, Ryuki Matsushita, Ryutaro Shiraishi, Maki Nagashima, Ayato Kimura, Kotaro Matsuishi, Makina Yabashi, Yoshihito Tanaka, Giorgio Rossi, Tetsuya Ishikawa, Kai Rossnagel, Masaki Oura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Time-resolved hard X-ray photoelectron spectroscopy (trHAXPES) using microfocused X-ray free-electron laser (XFEL, hv= 8 keV) pulses as a probe and infrared laser pulses (hv=1.55 eV) as a pump is employed to determine intrinsic charge-carrier recombination dynamics in La:SrTiO3. By means of a combination of experiments and numerical N-body simulations, we first develop a simple approach to characterize and decrease XFEL-induced vacuum space-charge effects, which otherwise pose a serious limitation to spectroscopy experiments. We then show that, using an analytical mean-field model, vacuum space-charge effects can be counteracted by pump laser-induced photoholes at high excitation densities. This provides us a method to separate vacuum space-charge effects from the intrinsic charge-carrier recombination dynamics in the time domain. Our trHAXPES results thus open a route to studies of intrinsic charge-carrier dynamics on picosecond time scales with lateral spatial resolution on the micrometer scale.

Original languageEnglish
Article number35087
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Oct 12

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charge carriers
space charge
vacuum
photoelectron spectroscopy
pumps
x rays
pulses
free electron lasers
infrared lasers
lasers
micrometers
spatial resolution
routes
probes
spectroscopy
excitation
simulation

All Science Journal Classification (ASJC) codes

  • General

Cite this

Oloff, Lars Philip ; Chainani, Ashish Atma ; Matsunami, Masaharu ; Takahashi, Kazutoshi ; Togashi, Tadashi ; Osawa, Hitoshi ; Hanff, Kerstin ; Quer, Arndt ; Matsushita, Ryuki ; Shiraishi, Ryutaro ; Nagashima, Maki ; Kimura, Ayato ; Matsuishi, Kotaro ; Yabashi, Makina ; Tanaka, Yoshihito ; Rossi, Giorgio ; Ishikawa, Tetsuya ; Rossnagel, Kai ; Oura, Masaki. / Time-resolved HAXPES using a microfocused XFEL beam : From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics. In: Scientific reports. 2016 ; Vol. 6.
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title = "Time-resolved HAXPES using a microfocused XFEL beam: From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics",
abstract = "Time-resolved hard X-ray photoelectron spectroscopy (trHAXPES) using microfocused X-ray free-electron laser (XFEL, hv= 8 keV) pulses as a probe and infrared laser pulses (hv=1.55 eV) as a pump is employed to determine intrinsic charge-carrier recombination dynamics in La:SrTiO3. By means of a combination of experiments and numerical N-body simulations, we first develop a simple approach to characterize and decrease XFEL-induced vacuum space-charge effects, which otherwise pose a serious limitation to spectroscopy experiments. We then show that, using an analytical mean-field model, vacuum space-charge effects can be counteracted by pump laser-induced photoholes at high excitation densities. This provides us a method to separate vacuum space-charge effects from the intrinsic charge-carrier recombination dynamics in the time domain. Our trHAXPES results thus open a route to studies of intrinsic charge-carrier dynamics on picosecond time scales with lateral spatial resolution on the micrometer scale.",
author = "Oloff, {Lars Philip} and Chainani, {Ashish Atma} and Masaharu Matsunami and Kazutoshi Takahashi and Tadashi Togashi and Hitoshi Osawa and Kerstin Hanff and Arndt Quer and Ryuki Matsushita and Ryutaro Shiraishi and Maki Nagashima and Ayato Kimura and Kotaro Matsuishi and Makina Yabashi and Yoshihito Tanaka and Giorgio Rossi and Tetsuya Ishikawa and Kai Rossnagel and Masaki Oura",
year = "2016",
month = "10",
day = "12",
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Oloff, LP, Chainani, AA, Matsunami, M, Takahashi, K, Togashi, T, Osawa, H, Hanff, K, Quer, A, Matsushita, R, Shiraishi, R, Nagashima, M, Kimura, A, Matsuishi, K, Yabashi, M, Tanaka, Y, Rossi, G, Ishikawa, T, Rossnagel, K & Oura, M 2016, 'Time-resolved HAXPES using a microfocused XFEL beam: From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics', Scientific reports, vol. 6, 35087. https://doi.org/10.1038/srep35087

Time-resolved HAXPES using a microfocused XFEL beam : From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics. / Oloff, Lars Philip; Chainani, Ashish Atma; Matsunami, Masaharu; Takahashi, Kazutoshi; Togashi, Tadashi; Osawa, Hitoshi; Hanff, Kerstin; Quer, Arndt; Matsushita, Ryuki; Shiraishi, Ryutaro; Nagashima, Maki; Kimura, Ayato; Matsuishi, Kotaro; Yabashi, Makina; Tanaka, Yoshihito; Rossi, Giorgio; Ishikawa, Tetsuya; Rossnagel, Kai; Oura, Masaki.

In: Scientific reports, Vol. 6, 35087, 12.10.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-resolved HAXPES using a microfocused XFEL beam

T2 - From vacuum space-charge effects to intrinsic charge-carrier recombination dynamics

AU - Oloff, Lars Philip

AU - Chainani, Ashish Atma

AU - Matsunami, Masaharu

AU - Takahashi, Kazutoshi

AU - Togashi, Tadashi

AU - Osawa, Hitoshi

AU - Hanff, Kerstin

AU - Quer, Arndt

AU - Matsushita, Ryuki

AU - Shiraishi, Ryutaro

AU - Nagashima, Maki

AU - Kimura, Ayato

AU - Matsuishi, Kotaro

AU - Yabashi, Makina

AU - Tanaka, Yoshihito

AU - Rossi, Giorgio

AU - Ishikawa, Tetsuya

AU - Rossnagel, Kai

AU - Oura, Masaki

PY - 2016/10/12

Y1 - 2016/10/12

N2 - Time-resolved hard X-ray photoelectron spectroscopy (trHAXPES) using microfocused X-ray free-electron laser (XFEL, hv= 8 keV) pulses as a probe and infrared laser pulses (hv=1.55 eV) as a pump is employed to determine intrinsic charge-carrier recombination dynamics in La:SrTiO3. By means of a combination of experiments and numerical N-body simulations, we first develop a simple approach to characterize and decrease XFEL-induced vacuum space-charge effects, which otherwise pose a serious limitation to spectroscopy experiments. We then show that, using an analytical mean-field model, vacuum space-charge effects can be counteracted by pump laser-induced photoholes at high excitation densities. This provides us a method to separate vacuum space-charge effects from the intrinsic charge-carrier recombination dynamics in the time domain. Our trHAXPES results thus open a route to studies of intrinsic charge-carrier dynamics on picosecond time scales with lateral spatial resolution on the micrometer scale.

AB - Time-resolved hard X-ray photoelectron spectroscopy (trHAXPES) using microfocused X-ray free-electron laser (XFEL, hv= 8 keV) pulses as a probe and infrared laser pulses (hv=1.55 eV) as a pump is employed to determine intrinsic charge-carrier recombination dynamics in La:SrTiO3. By means of a combination of experiments and numerical N-body simulations, we first develop a simple approach to characterize and decrease XFEL-induced vacuum space-charge effects, which otherwise pose a serious limitation to spectroscopy experiments. We then show that, using an analytical mean-field model, vacuum space-charge effects can be counteracted by pump laser-induced photoholes at high excitation densities. This provides us a method to separate vacuum space-charge effects from the intrinsic charge-carrier recombination dynamics in the time domain. Our trHAXPES results thus open a route to studies of intrinsic charge-carrier dynamics on picosecond time scales with lateral spatial resolution on the micrometer scale.

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