Femtosecond Charge Density Modulations in Photoexcited CuWO4
Publication date
2021-04-08
Authors
Uemura, Yohei
Ismail, Ahmed S M
Park, Sang Han
Kwon, Soonnam
Kim, Minseok
Niwa, Yasuhiro
Wadati, Hiroki
Elnaggar, Hebatalla
Frati, Federica
Haarman, Ties
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Advisors
Supervisors
Document Type
Article
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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.
Keywords
Electronic, Optical and Magnetic Materials, General Energy, Physical and Theoretical Chemistry, Surfaces, Coatings and Films
Citation
Uemura, Y, Ismail, A S M, Park, S H, Kwon, S, Kim, M, Niwa, Y, Wadati, H, Elnaggar, H, Frati, F, Haarman, T, Höppel, N, Huse, N, Hirata, Y, Zhang, Y, Yamagami, K, Yamamoto, S, Matsuda, I, Katayama, T, Togashi, T, Owada, S, Yabashi, M, Halisdemir, U, Koster, G, Yokoyama, T, Weckhuysen, B M & De Groot, F M F 2021, 'Femtosecond Charge Density Modulations in Photoexcited CuWO 4', Journal of Physical Chemistry C, vol. 125, no. 13, pp. 7329-7336. https://doi.org/10.1021/acs.jpcc.0c10525