光激发CuWO₄中的飞秒电荷密度调制
Femtosecond Charge Density Modulations in Photoexcited CuWO.
作者信息
Uemura Yohei, Ismail Ahmed S M, Park Sang Han, Kwon Soonnam, Kim Minseok, Niwa Yasuhiro, Wadati Hiroki, Elnaggar Hebatalla, Frati Federica, Haarman Ties, Höppel Niko, Huse Nils, Hirata Yasuyuki, Zhang Yujun, Yamagami Kohei, Yamamoto Susumu, Matsuda Iwao, Katayama Tetsuo, Togashi Tadashi, Owada Shigeki, Yabashi Makina, Halisdemir Uufuk, Koster Gertjan, Yokoyama Toshihiko, Weckhuysen Bert M, de Groot Frank M F
机构信息
Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitslaan 99, 3584 CG Utrecht, The Netherlands.
Institute for Catalysis, Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan.
出版信息
J Phys Chem C Nanomater Interfaces. 2021 Apr 8;125(13):7329-7336. doi: 10.1021/acs.jpcc.0c10525. Epub 2021 Mar 26.
Copper tungstate (CuWO) 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 CuWO. The Cu L 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.
钨酸铜（CuWO）是一种重要的半导体，其复杂且存在争议的电子结构对其化学性质有直接影响。利用PAL-XFEL光源，我们研究了光激发的CuWO的电子动力学。光激发时，Cu L X射线吸收光谱向低能量方向移动，这意味着从氧价带至钨导带的光激发过程有效地增加了Cu原子上的电荷密度。这种光谱变化的衰减时间为400飞秒，表明增加的电荷密度仅在非常短的时间内存在，并通过电子方式弛豫。初始增加的电荷密度在超过200皮秒的时间尺度上引起结构变化。
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