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  Microscopic theory of light-induced ultrafast skyrmion excitation in transition metal films

Viñas Boström, E., Rubio, A., & Verdozzi, C. (2022). Microscopic theory of light-induced ultrafast skyrmion excitation in transition metal films. npj Computational Materials, 8(1): 62. doi:10.1038/s41524-022-00735-5.

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https://arxiv.org/abs/2010.16125 (Preprint)
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 Creators:
Viñas Boström, E.1, Author           
Rubio, A.1, 2, Author           
Verdozzi, C.3, Author
Affiliations:
1Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
2Center for Computational Quantum Physics (CCQ), The Flatiron Institute, ou_persistent22              
3Division of Mathematical Physics and ETSF, Lund University, ou_persistent22              

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 Abstract: Magnetic skyrmions are topological excitations of great promise for compact and efficient memory storage. However, to interface skyrmionics with electronic devices requires efficient and reliable ways of creating and destroying such excitations. In this work, we unravel the microscopic mechanism behind ultrafast skyrmion generation by femtosecond laser pulses in transition metal thin films. We employ a theoretical approach based on a two-band electronic model, and show that by exciting the itinerant electronic subsystem with a femtosecond laser ultrafast skyrmion nucleation can occur on a 100 fs timescale. By combining numerical simulations with an analytical treatment of the strong s–d exchange limit, we identify the coupling between electronic currents and the localized d-orbital spins, mediated via Rashba spin–orbit interactions among the itinerant electrons, as the microscopic and central mechanism leading to ultrafast skyrmion generation. Our results show that an explicit treatment of itinerant electron dynamics is crucial to understand optical skyrmion generation.

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Language(s): eng - English
 Dates: 2021-06-072022-02-242022-04-08
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: arXiv: 2010.16125
DOI: 10.1038/s41524-022-00735-5
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Project name : We also acknowledge support from the European Research Council (ERC- 2015-AdG694097), the Cluster of Excellence “Advanced Imaging of Matter” (AIM) [...].
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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: 8 (1) Sequence Number: 62 Start / End Page: - Identifier: ISSN: 2057-3960
CoNE: https://pure.mpg.de/cone/journals/resource/2057-3960