Data di Pubblicazione:
2016
Citazione:
Femtomagnetism in graphene induced by core level excitation of organic adsorbates / A. Ravikumar, A. Baby, H. Lin, G..P. Brivio, G. Fratesi. ((Intervento presentato al 26. convegno CMD tenutosi a Groningen nel 2016.
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 no more magnetic. [1]
[1] A. Ravikumar, A. Baby, H. Lin, G. P. Brivio, and G. Fratesi, Scientific Reports 6, Article number: 24603
(2016) doi:10.1038/srep24603
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
A. Ravikumar, A. Baby, H. Lin, G..P. Brivio, G. Fratesi
Link alla scheda completa: