Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9595205 | Surface Science | 2005 | 14 Pages |
Abstract
The quasi-one-dimensional electron gas is studied for chain arrays on In/Si(1 1 1)4 Ã 1 and 4 Ã 2 surfaces using first-principles electronic-structure calculations. The band-structure calculations indicate a metallic (4 Ã 1) and a semimetallic (4 Ã 2) surface system. The latter result contradicts the interpretation of recent photoemission measurements. The partial occupation of the surface bands gives rise to an electron gas with an ill-defined dimensionality but a strong anisotropy. The square of the anisotropic plasma-frequency varies significantly between the directions parallel and perpendicular to the chains. We discuss consequences for the electrical conductivity, optical reflectance anisotropy and electron-energy losses and compare with available experimental data. The results and the comparison with experiments clearly indicate gap openings and a reduction of the metallicity during the phase transition 4 Ã 1 â 4 Ã 2 but not an insulating 4 Ã 2 phase.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
X. López-Lozano, A.A. Stekolnikov, J. Furthmüller, F. Bechstedt,