Superstructures on graphite near platinum particles

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Abstract
We present STM images of 4 different superstructures on highly oriented pyrolytic graphite near adsorbed platinum particles. The patterns are independent of the size of the particles and decay within a distance of 2-5 nm into the graphite lattice. When Fourier transformed, the structures contain up to three pairs of first-order components in addition to those of graphite. They can be considered as periodic charge density modulations and described by the superposition of three standing electron density waves with different intensities and phases but with the same period of 1.5a (a, the lattice constant of graphite), rotated 30-degrees relative to the graphite lattice.

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