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The photoluminescence (PL) of alloys in the system a - Si 1 - x Ge x :H shows the presence of two bands, one which peaks at higher energies (1.2 – 1.4 eV in a -Si:H) and one which peaks at lower energies (0.8 – 0.9 eV). For all values of x studied ( 0≤x≤0.52 ), the position of the...
We consider a pair of oppositely charged solitons on neighboring chains. The electrostatic attraction between them gives rise to a finite pinning frequency. This result can account for the photoinduced infrared absorption peak near 500 cm - 1 .
The interface polariton modes in semiconducting quasiperiodic superlattices are studied with aid of transfer matrices. A miniband structure in the polariton dispersion has been discovered.
We present the results of a study of the room-temperature polarized reflectance of (1:2) 1,1 ’ -dimethylferrocenium ditetracyanoquinodimethanide ( Me 2 Fc)(TCNQ ) 2 over the range between the far infrared and the near ultraviolet. Kramers-Kronig analysis of the reflectance is used to determine...
The evolution of the electronic structure and bonding of Cu to AlN has been studied both experimentally and theoretically. Ab initio total-energy pseudofunction calculations indicate that the Cu adsorbate initially prefers formation of Cu – Al bonds, not Cu – N bonds. This theoretical finding...
We suggest that metal multilayer systems can be fruitfully modeled by crystalline-layer-type compounds. As an example we have performed first-principles local-density calculations on the platinum-tantalum system for two compounds, PtTa and Pt 2 Ta. The crystal structures considered were CsCl,...
Photoemission spectroscopy of ultrathin hydrogenated amorphous silicon films on silicon oxide show that the interfaces are atomically abrupt. The Si 3 p valence band is already developed in monolayer-thick islands. The absence of quantum-size effects associated with holes indicates that the Si 3...
Thermoelectric-power and resistivity experiments give evidence for the coexistence of a large electron and a small hole band in hydrogen-potassium-graphite ternary intercalation compounds consisting of ionic K-H-K sandwich intercalants between metallic graphite sheets. Potassium acts as a donor...
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