Influence of the degree of decoupling of graphene on the properties of transition metal adatoms

We investigate the adsorption sites of 3d transition metal (TM) adatoms by means of low-temperature scanning tunneling microscopy and spectroscopy. Co and Ni adatoms were adsorbed on two types of graphene on SiC(0001), i.e., pristine epitaxial monolayer graphene (MLG) and quasi-free-standing monolay...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-05, Vol.87 (20), Article 205443
Main Authors: Eelbo, T., Waśniowska, M., Gyamfi, M., Forti, S., Starke, U., Wiesendanger, R.
Format: Article
Language:English
Subjects:
Adsorption
Condensed matter
Decoupling
Fermions
Graphene
Monolayers
Scattering
Transition metals
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Summary:We investigate the adsorption sites of 3d transition metal (TM) adatoms by means of low-temperature scanning tunneling microscopy and spectroscopy. Co and Ni adatoms were adsorbed on two types of graphene on SiC(0001), i.e., pristine epitaxial monolayer graphene (MLG) and quasi-free-standing monolayer graphene (QFMLG). In the case of QFMLG, two stable adsorption sites are identified, while in the case of MLG, only one adsorption site is observed. Our experimental results reveal the decoupling efficiency as a crucial parameter for determining the adsorption site as well as the electronic properties of 3d transition metal atoms on graphene. Furthermore, we show that Co atoms adsorbed on QFMLG are strong scattering potentials for Dirac fermions and cause intervalley scattering in their vicinity.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.87.205443