Correlation between STM-induced photon emission and barrier height: The case of the alloy vicinal surface
CEA-Saclay, Service de Physique et Chimie des Surfaces
et Interfaces F-91191 Gif-sur-Yvette Cedex, France
Accepted: 3 September 2003
The photon emission induced by STM on the vicinal surface is found to present a yield comparable to pure . The control of the chemical ordering process permits to obtain ordered phases with a surface exhibiting either a paired-stepped structure with mixed - terraces over a pure atomic plane or a facetted structure. The STM-induced luminescence intensity of both surface types presents a high contrast between terraces and step edges. The photon emission efficiency is strongly correlated with the local barrier height, itself being influenced by local chemical characteristics and step distribution.
PACS: 73.20.At – Surface states, band structure, electron density of states / 73.40.Gk – Tunneling / 78.68.+m – Optical properties of surfaces
© EDP Sciences, 2003