Publications (9)
Local electronic properties of single wall nanotube circuits measured by conducting-tip AFM
M. Freitag, M. RadosavljeviÄ, W. Clauss +1
We use conducting-tip atomic force microscopy (AFM) to measure local electronic properties of single wall carbon nanotube (SWNT) circuits on insulating substrates. When a voltage i…
High resolution study of the yellow excitons in CuO subject to an electric field
J. Heckötter, M. Freitag, D. Fröhlich +4
We have used high resolution transmission spectroscopy to study the exciton level spectrum in CuO subject to a longitudinal external electric field, i.e., in the geometry where…
Rydberg excitons in the presence of an ultralow-density electron-hole plasma
J. Heckötter, M. Freitag, D. Fröhlich +7
We use two-color pump-probe spectroscopy to study Rydberg excitons in CuO in the presence of free carriers injected by above-band-gap excitation. Already at plasma densities $Ï…
Scaling laws of Rydberg excitons
J. Heckötter, M. Freitag, D. Fröhlich +4
Rydberg atoms have attracted considerable interest due to their huge interaction among each other and with external fields. They demonstrate characteristic scaling laws in dependen…
The role of contacts in graphene transistors: A scanning photocurrent study
T. Mueller, F. Xia, M. Freitag +2
A near-field scanning optical microscope is used to locally induce photocurrent in a graphene transistor with high spatial resolution. By analyzing the spatially resolved photo-res…
Physical Processes in Star-Gas Systems
R. Spurzem, P. Berczik, G. Hensler +4
First we present a recently developed 3D chemodynamical code for galaxy evolution from the K**2 collaboration. It follows the evolution of all components of a galaxy such as dark m…