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Ravikumar A, Baby A, Lin H, et al. Femtomagnetism in graphene induced by core level excitation of organic adsorbates. Sci Rep. 2016;6:24603doi: 10.1038/srep24603.
Ravikumar, A., Baby, A., Lin, H., Brivio, G. P., & Fratesi, G. (2016). Femtomagnetism in graphene induced by core level excitation of organic adsorbates. Scientific reports, 624603. https://doi.org/10.1038/srep24603
Ravikumar, Abhilash, et al. "Femtomagnetism in graphene induced by core level excitation of organic adsorbates." Scientific reports vol. 6 (2016): 24603. doi: https://doi.org/10.1038/srep24603
Ravikumar A, Baby A, Lin H, Brivio GP, Fratesi G. Femtomagnetism in graphene induced by core level excitation of organic adsorbates. Sci Rep. 2016 Apr 19;6:24603. doi: 10.1038/srep24603. PMID: 27089847; PMCID: PMC4835731.
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Sci Rep. 2016 Apr 19;6:24603. doi: 10.1038/srep24603.

Femtomagnetism in graphene induced by core level excitation of organic adsorbates.

Scientific reports

Abhilash Ravikumar, Anu Baby, He Lin, Gian Paolo Brivio, Guido Fratesi

Affiliations

  1. Dipartimento di Scienza dei Materiali, Università di Milano-Bicocca, Via Cozzi 55 - 20125 Milano, Italia.
  2. Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria, 16 - 20133 Milano, Italia.

PMID: 27089847 PMCID: PMC4835731 DOI: 10.1038/srep24603

Abstract

We predict the induction or suppression of magnetism in the valence shell of physisorbed and chemisorbed organic molecules on graphene occurring on the femtosecond time scale as a result of core level excitations. For physisorbed molecules, where the interaction with graphene is dominated by van der Waals forces and the system is non-magnetic in the ground state, numerical simulations based on density functional theory show that the valence electrons relax towards a spin polarized configuration upon excitation of a core-level electron. The magnetism depends on efficient electron transfer from graphene on the femtosecond time scale. On the other hand, when graphene is covalently functionalized, the system is magnetic in the ground state showing two spin dependent mid gap states localized around the adsorption site. At variance with the physisorbed case upon core-level excitation, the LUMO of the molecule and the mid gap states of graphene hybridize and the relaxed valence shell is not magnetic anymore.

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