SCANNING TUNNELING SPECTROSCOPY OF ONE-DIMENSIONAL SURFACE-STATES ON A METAL-SURFACE

Scanning tunneling spectroscopy permits real-space observation of one- dimensional electronic states on a Fe(100) surface alloyed with Si. Th ese states are localized along chains of Fe atoms in domain boundaries of the Fe(100) c(2 x 2)Si surface alloy, as confirmed by first-princi ples spin-polarized calculations. The calculated charge densities illu strate the d-like orbital character of the one-dimensional state and s how its relationship to a two-dimensional state existing on the pure F e(100) surface.