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  Attosecond screening dynamics mediated by electron localization in transition metals

Volkov, M., Sato, S., Schlaepfer, F., Kasmi, L., Hartmann, N., Lucchini, M., et al. (2019). Attosecond screening dynamics mediated by electron localization in transition metals. Nature Physics. doi:10.1038/s41567-019-0602-9.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-743C-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-BD28-B
Genre: Journal Article

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https://arxiv.org/abs/1811.00801 (Preprint)
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https://dx.doi.org/10.1038/s41567-019-0602-9 (Publisher version)
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 Creators:
Volkov, M.1, Author
Sato, S.2, 3, Author              
Schlaepfer, F.1, Author
Kasmi, L.1, Author
Hartmann, N.1, Author
Lucchini, M.1, Author
Gallmann, L.1, Author
Rubio, A.2, 3, 4, Author              
Keller, U.1, Author
Affiliations:
1Department of Physics, ETH Zurich, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Center for Free-Electron Laser Science, ou_persistent22              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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 Abstract: Transition metals, with their densely confined and strongly coupled valence electrons, are key constituents of many materials with unconventional properties1, such as high-temperature superconductors, Mott insulators and transition metal dichalcogenides2. Strong interaction offers a fast and efficient lever to manipulate electron properties with light, creating promising potential for next-generation electronics3,4,5,6. However, the underlying dynamics is a hard-to-understand, fast and intricate interplay of polarization and screening effects, which are hidden below the femtosecond timescale of electronic thermalization that follows photoexcitation7. Here, we investigate the many-body electron dynamics in transition metals before thermalization sets in. We combine the sensitivity of intra-shell transitions to screening effects8 with attosecond time resolution to uncover the interplay of photo-absorption and screening. First-principles time-dependent calculations allow us to assign our experimental observations to ultrafast electronic localization on d orbitals. The latter modifies the electronic structure as well as the collective dynamic response of the system on a timescale much faster than the light-field cycle. Our results demonstrate a possibility for steering the electronic properties of solids before electron thermalization. We anticipate that our study may facilitate further investigations of electronic phase transitions, laser–metal interactions and photo-absorption in correlated-electron systems on their natural timescales.

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Language(s): eng - English
 Dates: 2018-08-302019-06-212019-08-052019
 Publication Status: Published in print
 Pages: -
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 Rev. Method: Peer
 Identifiers: arXiv: 1811.00801
DOI: 10.1038/s41567-019-0602-9
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Project name : The authors acknowledge discussions with E. Krasovskii. S.A.S. and A.R. thank M. J. T. Oliveira for helping with the generation of a transferable pseudopotential for Ti, dealing with semicore electrons. This work was supported by the National Center of Competence in Research – Molecular Ultrafast Science and Technology (NCCR MUST) funded by the Swiss National Science Foundation. The authors acknowledge financial support from the European Research Council (ERC-2015-AdG-694097) and the European Union’s Horizon 2020 Research and Innovation programme under grant agreement no. 676580 (NOMAD). S.A.S. acknowledges support from the Alexander von Humboldt Foundation.
Grant ID : 676580
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Nature Physics
  Other : Nat. Phys.
Source Genre: Journal
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Publ. Info: London : Nature Pub. Group
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: ISSN: 1745-2473
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000025850