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Electronic properties of heterostructures,
quantum wells, superlattices, and molecular systems, in particular the influence of quantum
phenomena on the transport and optical response are the main topics of von
Klitzing's group. Optical and transport measurements in magnetic
fields up to B = 20 Tesla and temperatures down to 20 mK are used to characterize
systems. The quantum Hall effect is studied by analyzing the electrical breakdown,
the time-resolved transport, the edge channels and the behaviour of
Electron-phonon interactions in low-dimensional systems and the phonon transmission through
interfaces are investigated with ballistic
phonon-techniques. Time-resolved photoconductivity, luminescence, and Raman measurements in
magnetic fields are methods of characterizing the low dimensional electronic systems.
A strong current interest is
the preparation of nanostructures either by selforganized growth or by lithographic and
synthetic routes (nanotubes and other synthetic nanoparticles) and the investigation
of coupled two- and zero-dimensional electronic systems (electron drag,
single electron transistor).
The experiments are supported within the group by theoretical
investigations of the transport and dynamic response of these
low-dimensional electronic systems.