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We introduce a variational total-energy functional to treat finite homogeneous electric fields with periodic boundary conditions and show that this functional can be implemented within a Car-Parrinello molecular dynamics scheme. The Coupling to an electric ...
We present what we believe to be a new digital holographic imaging method that is able to determine simultaneously the distributions of intensity, phase, and polarization state at the surface of a specimen on the basis of a single image acquisition. Two re ...
Synchrotron radiation induced total reflection X-ray fluorescence (TXRF) and conventional 45 degrees energy dispersive X-ray fluorescence analysis (EDXRF) using a 150-nm-thick AP1 (TM) film as sample carrier have been exploited for the elemental analysis o ...
In the present paper, we address a review of group-III nitride quantum wells and quantum dots realized by molecular beam epitaxy (MBE) using ammonia as a nitrogen source. Some important features of the growth of nitrides by MBE using ammonia are pointed ou ...
Synchrotron radiation-induced total reflection x-ray fluorescence (TXRF) analysis was used for the trace element analysis of steels exploited in the construction of core components of existing fission plants and future fusion power plants. Detection of tra ...
We present a combined theoretical and experimental analysis to describe the interplay between polarization field, charge screening, and radiative and nonradiative recombinations in AlGaN/ GaN-based nanostructures. We perform the study of photoluminescence ...
The paper presents experimental results obtained as part of the GEMCAR European project using the VERIFY EMP simulator belonging to the Swiss Defense Procurement Agency (Spiez). VERIFY generates a vertically polarized electric field with a rise time of 0.9 ...
An investigation of the parametric amplification and its coherent control in a semiconductor micro-cavity is presented. The time and angle resolved pump and probe experiments show that several ps after pumping parametric scattering is still phase coherent. ...
We present an experimental study of the dynamical screening effect of the built-in field in GaN-based quantum well structures by means of picosecond time-resolved luminescence measurements. Our results clearly show that the recombination dynamics of the ph ...
The direct observation of blocked polarization domains at the electrode-ferroelectric interface of electrically fatigued ferroelectric films is reported. Blocked nanodomains are believed to be the origin of polarization fatigue in ferroelectric nonvolatile ...