Halbleiter-Schichtsysteme in Kürze:
In epitaxial nanostructures electronic and optical waves are confined to the nanometer scale, so their opto-electronic properties are governed by size-quantization effects. The single-crystal quality of epitaxial structures allow for the study of quantum effects without interference from uncontrolled impurities and defects. Molecular-beam epitaxy allows us to control the composition of semiconductor heterostructures on the nanometer scale. We prepare precisely tailored low-dimensional, ultra-pure and defect-free semiconductor crystals for electronics as well as spintronics and optics. Ongoing research employs self-organisation mechanisms as a route towards ultra-small structures with well controlled properties.
Woran wir forschen:
Molecular beam epitaxy of semiconductor heterostructures. Investigation of low-dimensional high-mobility charge carrier systems. Quantum effects at low temperatures (down to 10 mK) and high magnetic fields (up to 16 T).
Study of self-organisation mechanisms. Such techniques allow, for example, the fabrication of quantum dots or self-rolling nanotubes.
Study of spintronic devices consisting of diluted magnetic semiconductors or ferromagnetic metal/semiconductor hybrids.
Fabrication and nanostructuring of monolayer Graphene sheets on semiconductors. Study of the magneto-conductivity of Graphene films.
For characterisation and investigation of our heterostructures atomic force microscopy at room temperature, time resolved capacitance spectroscopy and magnetotransport measurements at temperatures down to 10 mK and in magnetic fields up to 16 T are established tools in our research group.