1 research outputs found
Probing the Site-Dependent Kondo Response of Nanostructured Graphene with Organic Molecules
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 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