期刊
MATERIALS RESEARCH LETTERS
卷 11, 期 8, 页码 655-661出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2023.2210606
关键词
Ferromagnetism; local correlations; ultrafast dynamics; time-resolved x-ray absorption spectroscopy; time-dependent density functional theory
By combining femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory, we analyze the electronic structure of fcc Ni on a femtosecond time scale. We observe transient broadening and energy shifts in the absorption spectra, which are explained by electron repopulation and correlation-induced modifications of the electronic structure, accounting for the local Coulomb interaction.
The complex electronic structure of metallic ferromagnets is determined by a balance between exchange interaction, electron hopping leading to band formation, and local Coulomb repulsion. By combining high energy and temporal resolution in femtosecond time-resolved X-ray absorption spectroscopy with ab initio time-dependent density functional theory we analyze the electronic structure in fcc Ni on the time scale of these interactions in a pump-probe experiment. We distinguish transient broadening and energy shifts in the absorption spectra, which we demonstrate to be captured by electron repopulation respectively correlation-induced modifications of the electronic structure, requiring to take the local Coulomb interaction into account.
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