We propose and apply a combination of an ab initio (band-structure) calculation with a many-body treatment including screening effects. We start from a linearized muffin-tin orbital (LMTO) calculation to determine the Bloch functions for the Hartree one-particle Hamiltonian, from which we...

Zero-dimensional nanocrystals, as obtained by chemical synthesis, offer a broad range of applications, as their spectrum and thus their excitation gap can be tailored by variation of their size. Additionally, nanocrystals of the type A<Subscript> x </Subscript>B<Subscript>1-</Subscript> <Subscript> x </Subscript>C can be realized by alloying of two pure compound...</subscript></subscript></subscript>

A theory-experiment comparison for the intensity and polarization dependence of spectrally resolved transient four-wave-mixing signals is presented for a ZnSe single quantum well. Results for high intensities deviate from a simple model based on the optical Bloch equations for a five-level...

Durch den sich in vielen Europäischen Ländern abzeichnenden demografischen Wandel steigt der Anteil jener Menschen in der Bevölkerung, die an altersassoziierten Krankheiten leiden. Dies führt zwangsläufig zu einem erhöhten Bedarf an Assistenz und Betreuung. Gleichzeitig wollen ältere...