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Probing the site-dependent kondo response of nanostructured graphene with organic molecules

AuthorsGarnica, Manuela; Stradi, D.; Calleja, Fabián; Barja, Sara; Díaz, Cristina; Alcamí, Manuel; Arnau, Andrés ; Vázquez de Parga, A. L.; Martín, Fernando; Miranda, Rodolfo
Issue Date2014
PublisherAmerican Chemical Society
CitationNano Letters 14(8): 4560-4567 (2014)
AbstractTCNQ molecules are used as a sensitive probe for the Kondo response of the electron gas of a nanostructured graphene grown on Ru(0001) presenting a moiré pattern. All adsorbed molecules acquired an extra electron by charge transfer from the substrate, but only those adsorbed in the FCC-Top areas of the moiré show magnetic moment and Kondo resonance in the STS spectra. DFT calculations trace back this behavior to the existence of a surface resonance in the low areas of the graphene moiré, whose density distribution strongly depends on the stacking sequence of the moiré area and effectively quenches the magnetic moment for HCP-Top sites. © 2014 American Chemical Society.
Identifiersdoi: 10.1021/nl501584v
e-issn: 1530-6992
issn: 1530-6984
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