Graphene lattice and Moire structure on a Pt(111) surface. The smaller hexagons are due to the atomic lattice of the graphene, and the
larger pattern is called a Moire pattern, owing to a lattice mismatch between the graphene and the underlying
Standing Waves on Pt(111)
Aaron J. Bradley Crommie Group 2012
dI/dV map of the Pt(111) surface, showing electron interference and standing wave patterns. When an impurity or
atomic step edge breaks the discrete translational symmetry along the surface of the crystal, the electrons
scatter and interfere with one another. This leads to the beautiful patterns seen below. From the wavelength of
these patterns, taken at different energies, one can map out the band structure of the Pt(111) surface state.
Graphene / Pt(111) Boundary
Aaron J. Bradley Crommie Group 2013
Edge of a graphene patch on Pt(111) surface. On the left side of the image is a graphene patch, which appears higher than
the underlying Pt surface (right side of image). Note the buckled regions along the boundary where excess strain can be
relieved. Also note that the image has inverted contrast, where features which usually appear as depressions instead appear
as peaks, and vise versa.