Electronic transport through a two-dimensional decananometer length channel with correlated and anticorrelated surfaces morphologies is studied using the Keldysh nonequilibrium Green's-function technique. Due to the pseudoperiodicity of these structures, the energy-resolved transmission possesses pseudoband and pseudogap. Channels with correlated surfaces are found to exhibit wider pseudobands than their anticorrelated counterparts. By surveying channels with various combinations of material parameters, we found that a smaller transport mass increases the channel transmittivity and energy bandwidth of the pseudobands. A larger quantization mass yields a larger transmittivity in channels with anticorrelated surfaces. For channels with correlated surfaces, the dependence of transmittivity on quantization mass is complicated by odd-to-even mode transitions. An enhanced threshold energy in the energy-resolved transmission can also be observed in the presence of surface roughness. The computed enhanced threshold energy was able to achieve agreement with the experimental data for Si〈110〉 and Si〈100〉 devices.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Oct 1 2008|