STM OF ANOMALOUS CARBON STRUCTURES

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Abstract
Understanding carbon in its various forms became recently the focus of many research activities due to the production of C 60 and other fullerenes. Besides the fullerenes, other novel forms of carbon might be realized in the laboratory. In this respect, the physics of low-dimensional carbon configurations is of special interest. We will discuss the effect of defects on a graphitic sheet, ‘rotated’ stacking of graphitic sheets, and the adsorption characteristics of submonolayer carbon on graphite. Using a scanning tunneling microscope, we find that the local density of states can strongly vary due to defects, or layer misorientations, leading to periodic modulations of the graphitic electron state density. A variety of observed anomalous structures are explained by lateral electron state density variations rather than by atomic reconstructions.

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