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A study of the intraband absorption coefficient in cuboid InAs quantum dot periodic nanostructures embedded in GaAs is presented. The miniband structure of electron states in the conduction band is related to the shape of the quantum dots. The effect of strain is also taken into account in the simulations through a previous 8×8 k•p calculation. We analyze the influence on the absorption coefficient...
A study of the physics of electronic states in cubic InAs quantum dot periodic nanostructures embedded in GaAs is presented. The miniband structure of electron states in the conduction band is related to the size and density of the quantum dots. The effect of strain is also taken into account in the simulations. The photon-electron absorption coefficient is obtained for different quantum dot configurations...
In this work we have theoretically investigated photon absorption coefficient in ordered InAs/GaAs cubic quantum dot systems. We solved the Schrodinger equation associated with these structures, using a set of 13 × 13 × 13 plane waves at 12,167 equally spaced points of the Q space. We investigated the transitions between minibands arising from the conduction band, taking into account the different...
Titan is the largest satellite of Saturn, and the only one to have a dense atmosphere. Whereas its surface cannot be seen at visible wavelengths due to the strong absorption and scattering of the atmospheric gases (mainly N2 and CH4) and aerosols, it can be seen at specific wavelengths in the infrared. We focus in this paper on the global mapping of Titan geological units using the Visual and Infrared...
The surface of Titan, the largest icy moon of Saturn, is veiled by a very thick and hazy atmosphere. The Visual and Infrared Mapping Spectrometer onboard the Cassini spacecraft, in orbit around Saturn since July 2004, conduct an intensive survey of Titan with the objective to understand the complex nature of the atmosphere and surface of the mysterious moon and the way they interact. Accurate radiative...
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