Demetra Psiachos

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Single-walled carbon nanotubes are strongly correlated systems with large Coulomb repulsion between two electrons occupying the same p(z) orbital. Within a molecular Hamiltonian appropriate for correlated π-electron systems, we show that optical excitations polarized parallel to the nanotube axes in the so-called metallic single-walled carbon nanotubes are(More)
This thesis reports an ab initio study of the Ge(111)-5×5 reconstruction, which forms on top of a Si(111)-7×7 substrate. Detailed descriptions of the structural and electronic properties of this surface, obtained from density-functional calculations, are presented and analyzed. A study of In clusters on this surface is performed, and compared with recent(More)
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