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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. (2022). Attosecond magnetization dynamics in non-magnetic materials driven by intense femtosecond lasers.

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2207.06711.pdf (Preprint), 3MB
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2207.06711.pdf
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File downloaded from arXiv at 2022-07-15
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https://arxiv.org/abs/2207.06711 (Preprint)
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 Creators:
Neufeld, O.1, 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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Free keywords: Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Physics, Optics, physics.optics
 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 non-resonant strong-field regime. Through state-of-the-art ab-initio calculations, we predict that a non-magnetic material can be transiently transformed into a magnetic one via dynamical extremely nonlinear spin-flipping processes, which occur on attosecond timescales and are mediated by a combination of multi-photon and spin-orbit interactions. These are non-perturbative non-resonant analogues to the inverse Faraday effect that build up from cycle-to-cycle as electrons gain angular momentum. Remarkably, we show that even for linearly polarized driving, where one does not intuitively expect any magnetic response, the magnetization transiently oscillates as the system interacts with light. This oscillating response is enabled by transverse anomalous light-driven currents in the solid, and typically occurs on timescales of ~500 attoseconds. We further demonstrate that the speed of magnetization can be controlled by tuning the laser wavelength and intensity. An experimental set-up capable of measuring these dynamics through pump-probe transient absorption spectroscopy is outlined and simulated. Our results pave the way for new regimes of ultrafast manipulation of magnetism.

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Language(s): eng - English
 Dates: 2022-07-14
 Publication Status: Published online
 Pages: 21
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2207.06711
 Degree: -

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