Large Fermi density waves on the reconstructed Pt(100) surface

Several long-range superstructures have been observed with the scanning tun neling microscopy on the reconstructed Pt(100) surface at room temperature. They are present in strained domains and involve both the Fermi electrons and the concomitant lattice distortions. A first-principles calculation sho ws that the top layer expanded similar to 18% on average and the Fermi surf ace for a single hexagon layer displays some nesting portions, which can be related to the wave vectors of the observed superstructures. Thus, these s uperstructures existing in the local domains of the reconstructed surface h ave the likely origin of incipent charge density waves.