Recent advances in the growth, doping and characterization of III-V nitride thin films.- Native defects and impurities in GaN.- Semimagnetic semiconductor heterostructures and superlattices.- Selection rules for spectroscopy of quantum dots.- Spectroscopy on field-effect induced quantum wires and quantum dots.- Self-ordered quantum dots: A new growth mode on high-index semiconductor surfaces.- Pseudomorphic InAs/GaAs quantum dots on low index planes.- GaAs/AlGaAs quantum wire lasers and other low-dimensional structures fabricated by cleaved edge overgrowth.- Dynamics of optical excitations in quantum dots of wide-gap semiconductors.- Investigation of the coulomb blockade in a parallel quantum dot geometry.- Zero-bias anomalies and boson-assisted transport through small quantum dots.- Single-electron trapping at semiconductor interfaces.- Transport studies of AlxGa1?x As/GaAs quantum heterostructures using BEEM.- Atomic resolution with a megavolt electron microscope.- Surface modifications due to strain relaxation in lattice-mismatched heteroepitaxy.- Scanning probe microscopy with "chemical sensitivity".