Abstract
Copper tungstate (CuWO4) is an important semiconductor with a sophisticated and debatable electronic structure that has a direct impact on its chemistry. Using the PAL-XFEL source, we study the electronic dynamics of photoexcited CuWO4. The Cu L3 X-ray absorption spectrum shifts to lower energy upon photoexcitation, which implies that the photoexcitation process from the oxygen valence band to the tungsten conduction band effectively increases the charge density on the Cu atoms. The decay time of this spectral change is 400 fs indicating that the increased charge density exists only for a very short time and relaxes electronically. The initial increased charge density gives rise to a structural change on a time scale longer than 200 ps.
| Original language | English |
|---|---|
| Pages (from-to) | 7329-7336 |
| Number of pages | 8 |
| Journal | The Journal of physical chemistry C |
| Volume | 125 |
| Issue number | 13 |
| Early online date | 26 Mar 2021 |
| DOIs | |
| Publication status | Published - 8 Apr 2021 |
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In: The Journal of physical chemistry C, Vol. 125, No. 13, 08.04.2021, p. 7329-7336.
Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Femtosecond Charge Density Modulations in Photoexcited CuWO4
AU - Uemura, Yohei
AU - Ismail, Ahmed S.M.
AU - Park, Sang Han
AU - Kwon, Soonnam
AU - Kim, Minseok
AU - Niwa, Yasuhiro
AU - Wadati, Hiroki
AU - Elnaggar, Hebatalla
AU - Frati, Federica
AU - Haarman, Ties
AU - Höppel, Niko
AU - Huse, Nils
AU - Hirata, Yasuyuki
AU - Zhang, Yujun
AU - Yamagami, Kohei
AU - Yamamoto, Susumu
AU - Matsuda, Iwao
AU - Katayama, Tetsuo
AU - Togashi, Tadashi
AU - Owada, Shigeki
AU - Yabashi, Makina
AU - Halisdemir, Ufuk
AU - Koster, Gertjan
AU - Yokoyama, Toshihiko
AU - Weckhuysen, Bert M.
AU - De Groot, Frank M.F.
N1 - Funding Information: This work was financially supported by the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme (Grant Agreement 340279), The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), a Gravitation Program from The Netherlands Organisation for Scientific Research (NWO), a grant for collaborative research in the Institute for Catalysis, Hokkaido University (Grant 18A1005), a Grant-in-Aid for Scientific Research (A) (Grant 15H02173, JSPS), and a basic science research program funded by the Ministry of Education of Korea (Grants NRF-2020R1A2C1007416 and 2018R1D1A1B07046676). N. Huse and N. Höppel acknowledge funding by the collaborative research center SFB 925 of the German Science Foundation (DFG), project 170620586. The experiment at SACLA was performed with an approval of Japan Synchrotron Radiation Research Institute (JASRI; Proposal 2018A8049). We thank Prof. Thomas Elsasser (Max-Born Institute/Humboldt Universität zu Berlin) and Prof. Kiyotaka Asakura (Hokkaido University) for useful comments and suggestions. Funding Information: This work was financially supported by the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme (Grant Agreement 340279), The Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), a Gravitation Program from The Netherlands Organisation for Scientific Research (NWO), a grant for collaborative research in the Institute for Catalysis Hokkaido University (Grant 18A1005), a Grant-in-Aid for Scientific Research (A) (Grant 15H02173, JSPS), and a basic science research program funded by the Ministry of Education of Korea (Grants NRF-2020R1A2C1007416 and 2018R1D1A1B07046676). N. Huse and N. Hoppel acknowledge funding by the collaborative research center SFB 925 of the German Science Foundation (DFG), project 170620586. The experiment at SACLA was performed with an approval of Japan Synchrotron Radiation Research Institute (JASRI; Proposal 2018A8049). We thank Prof. Thomas Elsasser (Max-Born Institute/Humboldt Universitat zu Berlin) and Prof. Kiyotaka Asakura (Hokkaido University) for useful comments and suggestions. Publisher Copyright: © 2021 The Authors. Published by American Chemical Society.
PY - 2021/4/8
Y1 - 2021/4/8
N2 - Copper tungstate (CuWO4) is an important semiconductor with a sophisticated and debatable electronic structure that has a direct impact on its chemistry. Using the PAL-XFEL source, we study the electronic dynamics of photoexcited CuWO4. The Cu L3 X-ray absorption spectrum shifts to lower energy upon photoexcitation, which implies that the photoexcitation process from the oxygen valence band to the tungsten conduction band effectively increases the charge density on the Cu atoms. The decay time of this spectral change is 400 fs indicating that the increased charge density exists only for a very short time and relaxes electronically. The initial increased charge density gives rise to a structural change on a time scale longer than 200 ps.
AB - Copper tungstate (CuWO4) is an important semiconductor with a sophisticated and debatable electronic structure that has a direct impact on its chemistry. Using the PAL-XFEL source, we study the electronic dynamics of photoexcited CuWO4. The Cu L3 X-ray absorption spectrum shifts to lower energy upon photoexcitation, which implies that the photoexcitation process from the oxygen valence band to the tungsten conduction band effectively increases the charge density on the Cu atoms. The decay time of this spectral change is 400 fs indicating that the increased charge density exists only for a very short time and relaxes electronically. The initial increased charge density gives rise to a structural change on a time scale longer than 200 ps.
UR - http://www.scopus.com/inward/record.url?scp=85105000999&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcc.0c10525
DO - 10.1021/acs.jpcc.0c10525
M3 - Article
AN - SCOPUS:85105000999
SN - 1932-7447
VL - 125
SP - 7329
EP - 7336
JO - The Journal of physical chemistry C
JF - The Journal of physical chemistry C
IS - 13
ER -