Trapping of electrons near chemisorbed hydrogen on graphene

Details Trapping of electrons near chemisorbed hydrogen on graphene Trapping of electrons near chemisorbed hydrogen on graphene

2010-02-03

arxiv.org/abs/1002.0793v1

Physics

Condensed Matter

Materials Science

11 pages, 8 figures, to be published in PRB

Scientific paper

Chemical adsorption of atomic hydrogen on a negatively charged single layer graphene sheet has been analyzed with ab-initio Density Functional Theory calculations. We have simulated both finite clusters and infinite periodic systems to investigate the effect of different ingredients of the theory, e.g. exchange and correlation potentials, basis sets, etc. Hydrogen's electron affinity dominates the energetic balance in the charged systems and the extra electron is predominantly attracted to a region nearby the chemisorbed atom. The main consequences are: (i) the cancellation of the unpaired spin resulting in a singlet ground-state, and (ii) a stronger interaction between hydrogen and the graphene sheet.

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