Probing the Site-Dependent Kondo Response of Nanostructured Graphene with Organic Molecules

Manuela Garnica, Daniele Stradi, Fabian Calleja, Sara Barja, Cristina Diaz, Manuel Alcami, Andres Arnau, Amadeo L. Vazquez de Parga, Fernando Martin, Rodolfo Miranda

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

TCNQ 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 moire 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 moire 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 moire, whose density distribution strongly depends on the stacking sequence of the moire area and effectively quenches the magnetic moment for HCP-Top sites.
Original languageEnglish
JournalNano letters
Volume14
Issue number8
Pages (from-to)4560-4567
Number of pages8
ISSN1530-6984
DOIs
Publication statusPublished - 2014
Externally publishedYes

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