Chair of solid state physics . ... Spectroscopy of semiconductors and dielectrics. ... Interband transitions and optical properties of semiconductors. ... Optical properties of metal in a Drude-Lorentz model. Excitons in solids. ... Impurity states in dielectrics and semiconductors. Optical orientation of electron and exciton spins in semiconductors. ... General insight onto interband transitions: electron-radiation interaction, quantum theory of optical transitions in semiconductors. ...