The interplay of local electron correlations and ultrafast spin dynamics in fcc Ni
Lojewski, Tobias; Elhanoty, Mohamed F.; Le Guyader, Loïc; Grånäs, Oscar; Agarwal, Naman; Boeglin, Christine; Carley, Robert; Castoldi, Andrea; David, Christian; Deiter, Carsten; Döring, Florian; Engel, Robin Y.; Erdinger, Florian; Fangohr, Hans; Fiorini, Carlo; Fischer, Peter; Gerasimova, Natalia; Gort, Rafael; deGroot, Frank; Hansen, Karsten; Hauf, Steffen; Hickin, David; Izquierdo, Manuel; Van Kuiken, Benjamin E.; Kvashnin, Yaroslav; Lambert, Charles Henri; Lomidze, David; Maffessanti, Stefano; Mercadier, Laurent; Mercurio, Giuseppe; Miedema, Piter S.; Ollefs, Katharina; Pace, Matthias; Porro, Matteo; Rezvani, Javad; Rösner, Benedikt; Rothenbach, Nico; Samartsev, Andrey; Scherz, Andreas; Schlappa, Justina; Stamm, Christian; Teichmann, Martin; Thunström, Patrik; Turcato, Monica; Yaroslavtsev, Alexander; Zhu, Jun; Beye, Martin; Wende, Heiko; Bovensiepen, Uwe; Eriksson, Olle; Eschenlohr, Andrea
(2023) Materials Research Letters, volume 11, issue 8, pp. 655 - 661
(Article)
Abstract
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
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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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Keywords: Ferromagnetism, Local correlations, Time-dependent density functional theory, Time-resolved x-ray absorption spectroscopy, Ultrafast dynamics
ISSN: 2166-3831
Publisher: Taylor and Francis Ltd.
Note: Funding Information: by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–Project-ID 278162697–SFB 1242 is gratefully acknowledged. The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at NSC and Uppmax partially funded by the Swedish Research Council through grant agreement no. 2018-05973. O. G. acknowledges financial support from the Strategic Research Council (SSF) grant ICA16-0037 and the Swedish Research Council (VR) grant 2019-03901. This work was also supported by the European Research Council via Synergy Grant 854843 - FASTCORR. O. E. acknowledges support also from eSSENCE, the Knut and Alice Wallenberg foundation, the Swedish Research Council (VR) and the Foundation for Strategic Research. C.B. was supported by the Region Grand Est [grant number 19P07304 - FEMTOSPIN]. P. S. M., R. Y. E. and M. B. acknowledge funding from the Helmholtz Association [grant number VH-NG-1105]. We acknowledge support by the Open Access Publication Fund of the University of Duisburg-Essen. The authors acknowledge European XFEL in Schenefeld, Germany, for provision of X -ray free-electron laser beamtime at the SCS instrument and would like to thank the staff for their assistance. Publisher Copyright: © 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.
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