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  Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers

Neufeld, O., Tancogne-Dejean, N., de Giovannini, U., Hübener, H., & Rubio, A. (2023). Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers. npj Computational Materials, 9(1): 39. doi:10.1038/s41524-023-00997-7.

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 Creators:
Neufeld, O.1, 2, Author           
Tancogne-Dejean, N.1, 2, Author           
de Giovannini, U.1, 2, 3, Author           
Hübener, H.1, 2, Author           
Rubio, A.1, 2, 4, Author           
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Free-Electron Laser Science, Hamburg, ou_persistent22              
3Università degli Studi di Palermo, Dipartimento di Fisica e Chimica—Emilio Segrè, ou_persistent22              
4Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              

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 Abstract: Irradiating solids with ultrashort laser pulses is known to initiate femtosecond timescale magnetization dynamics. However, sub-femtosecond spin dynamics have not yet been observed or predicted. Here, we explore ultrafast light-driven spin dynamics in a highly nonresonant strong-field regime. Through state-of-the-art ab initio calculations, we predict that a nonmagnetic material can transiently transform into a magnetic one via dynamical extremely nonlinear spin-flipping processes, which occur on attosecond timescales and are mediated by cascaded multi-photon and spin–orbit interactions. These are nonperturbative nonresonant analogs to the inverse Faraday effect, allowing the magnetization to evolve in very high harmonics of the laser frequency (e.g. here up to the 42nd, oscillating at ~100 attoseconds), and providing control over the speed of magnetization by tuning the laser power and wavelength. Remarkably, we show that even for linearly polarized driving, where one does not intuitively expect the onset of an induced magnetization, the magnetization transiently oscillates as the system interacts with light. This response is enabled by transverse light-driven currents in the solid, and typically occurs on timescales of ~500 attoseconds (with the slower femtosecond response suppressed). An experimental setup capable of measuring these dynamics through pump–probe transient absorption spectroscopy is simulated. Our results pave the way for attosecond regimes of manipulation of magnetism.

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Language(s): eng - English
 Dates: 2022-09-062023-03-072023-03-23
 Publication Status: Published online
 Pages: -
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 Rev. Type: Peer
 Identifiers: arXiv: 2207.06711
DOI: 10.1038/s41524-023-00997-7
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Project name : -
Grant ID : 860553
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : This work was supported by the Cluster of Excellence Advanced Imaging of Matter (AIM), Grupos Consolidados (IT1249-19), SFB925, “Light induced dynamics and control of correlated quantum systems” and has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 860553. The Flatiron Institute is a division of the Simons Foundation. O.N. gratefully acknowledges the generous support of a Schmidt Science Fellowship.
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Title: npj Computational Materials
  Abbreviation : npj Comput. Mater.
Source Genre: Journal
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Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 9 (1) Sequence Number: 39 Start / End Page: - Identifier: ISSN: 2057-3960
CoNE: https://pure.mpg.de/cone/journals/resource/2057-3960