Fyzikální ústav Akademie věd ČR

Structural properties and mechanism of formation of surface nanostructure of metals, semiconductors, and multi-component materials are studied by numerical simulations. Molecular dynamics and Monte-Carlo simulations are combined to achieve a multiscale description of the critical behavior of relevant statistical mechanical quantities.  The full text >>

Quantum coherence due to cooperative scatterings is studied. Of particular interest are effects of backscatterings on bulk transport properties of electrons in disordered media.
Effects of decoherence and dephasing of electrons interacting with optical phonons in quantum dots out of equilibrium are examined with non-equlibrium Green functions and transport equations.   The full text >>

Electron correlations are studied in tight-binding models with a screened local interaction of the Hubbard type. Advanced summation methods of Feynman diagrams for two-particle Green functions are the core of our interest. Various simplified forms of parquet equations mixing self-consistently multiple electron-electron and electron-hole scatterings are used to describe peculiarities of the strong-coupling regime.   The full text >>

Dilute magnetic semiconductors are prototype materials with structural, magnetic, transport, and optical properties determined by combined effects of disorder, electron correlations, and hybridization. Our theoretical study, based on density-functional theory, aims at facilitating magnetic behavior of DMS by optimizing the electronic structure and by controlling native defects and intentional co-doping. Starting from (Ga,Mn)As, we are interested in non-traditional DMS based, e.g., on mixed III-V semiconductors and I-II-V compounds.   The full text >>