Using scanning tunneling spectroscopy at 5K electrostatic potential profile on the Si(111) 3x 3 Ag surface has been obtained with high spatial and energy resolutions. The potential profile measured around a step edge was explained with the Coulomb potential screened by a two-dimensional electron system which intrinsically exists on the surface. Friedel oscillation, which is characteristic to the screening, was also observed in the potential images. Its shape and phase were discussed in comparison with those of standing waves.
ASJC Scopus subject areas
- Physics and Astronomy(all)