It is generally assumed that electrons in deep atomic corestates are highly localized and do not participate in the bondingof molecules and solids. This implies well-defined core-levelbinding energies and the absence of any splitting and band-likedispersion, a fact that is exploited in several powerful experimentaltechniques, such as X-ray photoemission spectroscopy.Violations of this assumption have been found for only a fewsmall molecules in the gas phase such as C2H2 or N2 withmuch stronger bonding and shorter bonding distances thanpresent in solids. Herewe report the observation of a sizeableband-like dispersion of the C 1s core level in graphene, asingle-layer honeycomb net of carbon atoms that is attractingconsiderable attention at present in the scientific community.The dispersion is observed as an emission-angle-dependentbinding-energy modulation and it is shown that under appropriateconditions only the bonding or antibonding statescan be observed. A very similar dispersion is also found byab initio calculations.

Band dispersion in the deep 1s core levels of graphene

LACOVIG, PAOLO;BARALDI, Alessandro;
2010-01-01

Abstract

It is generally assumed that electrons in deep atomic corestates are highly localized and do not participate in the bondingof molecules and solids. This implies well-defined core-levelbinding energies and the absence of any splitting and band-likedispersion, a fact that is exploited in several powerful experimentaltechniques, such as X-ray photoemission spectroscopy.Violations of this assumption have been found for only a fewsmall molecules in the gas phase such as C2H2 or N2 withmuch stronger bonding and shorter bonding distances thanpresent in solids. Herewe report the observation of a sizeableband-like dispersion of the C 1s core level in graphene, asingle-layer honeycomb net of carbon atoms that is attractingconsiderable attention at present in the scientific community.The dispersion is observed as an emission-angle-dependentbinding-energy modulation and it is shown that under appropriateconditions only the bonding or antibonding statescan be observed. A very similar dispersion is also found byab initio calculations.
http://www.nature.com/nphys/journal/v6/n5/pdf/nphys1615.pdf
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2297349
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