Non-local Aharonov-Bohm conductance oscillations in an asymmetric quan-tum ring (2008)
Buchholz, S. S., Fischer, S. F., Kunze, U., Reuter, D., Wieck, A. D.
We investigate ballistic transport and quantum interference in a nanoscale quantum wire loop fab-ricated as a GaAs/AlGaAs field-effect heterostructure. Four-terminal measurements of current and...
Collective single mode precession of electron spins in a quantum dot ensemble (2008)
Greilich, A., Spatzek, S., Yugova, I. A., Akimov, I. A., Yakovlev, D. R., Efros, Al. L., ...
We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. This regime is...
Rizo, P. J., Pugžlys, A., Liu, J., Reuter, D., Wieck, A. D., Van Der Wal, C. H., ...
A compact cryogenic Kerr microscope for operation in the small volume of high-field magnets is described. It is suited for measurements both in Voigt and Faraday configuration. Coupled with a pulsed...
Observation of excited states in a p-type GaAs quantum dot (2008)
Komijani, Y., Csontos, M., Ihn, T., Ensslin, K., Reuter, D., Wieck, A. D.
A quantum dot fabricated by scanning probe oxidation lithography on a p-type, C-doped GaAs/AlGaAs heterostructure is investigated by low temperature electrical conductance measurements. Clear Coulomb...
Disorder induced decoherence in mesoscopic wires (2008)
Niimi, Y., Baines, Y., Capron, T., Mailly, D., Wieck, A. D., ...
We present phase coherence time measurements in quasi one-dimensional mesoscopic wires made from high mobility two dimensional electron gas. By implanting gallium ions into a GaAs/AlGaAs...
Koop, E. J., Iqbal, M. J., Limbach, F., Boute, M., Van Wees, B. J., Reuter, D., ...
Ohmic contacts to a two-dimensional electron gas (2DEG) in GaAs/AlGaAs heterostructures are often realized by annealing of AuGe/Ni/Au that is deposited on its surface. We studied how the quality of...
Magnetic barrier induced conductance fluctuations in quantum wires (2008)
Hugger, S., Xu, Hengyi, Tarasov, A., Cerchez, M., Heinzel, T., Zozoulenko, I. V., ...
Quasi-ballistic semiconductor quantum wires are exposed to localized perpendicular magnetic fields, also known as magnetic barriers. Pronounced, reproducible conductance fluctuations as a function of...
Tunable ballistic rectification in a density-modulated two-dimensional-system (2008)
Ganczarczyk, A., Notthoff, C., Geller, M., Lorke, A., Reuter, D., Wieck, A. D.
We demonstrate tunable rectification in a density-modulated two-dimensional electron gas (2DEG). The density modulation is induced by two surface gates, running in parallel along a narrow strip of...
Auer, T., Oulton, R., Bauschulte, A., Yakovlev, D. R., Bayer, M., Verbin, S. Yu., ...
We present an investigation of the electron-nuclear spin system of negatively doped (In,Ga)As quantum dots (QDs) in millitesla transverse and longitudinal magnetic fields, with the aim of determining...
Temperature induced spin coherence dissipation in quantum dots (2008)
Hernandez, F. G. G., Greilich, A., Brito, F., Wiemann, M., Yakovlev, D. R., Reuter, D., ...
The temperature dependence of electron spin coherence in singly negatively charged (In,Ga)As/GaAs quantum dots is studied by time-resolved Faraday rotation. The decoherence time T2 is constant on a...
Sassine, S., Krupko, Yu., Kvon, Z. D., Murali, R., Martin, K. P., ...
We report on experimental evidence of directed electron transport, induced by external linear-polarized microwave irradiation, in a two-dimensional spatially-periodic asymmetrical system called...
Kaiser, F. J., Kohler, S., Hänggi, P., Malecha, M., Ebbecke, J., Wixforth, A., ...
Two strongly coupled quantum dots are theoretically and experimentally investigated. In the conductance measurements of a GaAs based low-dimensional system additional features to the Coulomb blockade...
Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot (2008)
Koop, E. J., Van Wees, B. J., Reuter, D., Wieck, A. D., Van Der Wal, C. H.
We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection was achieved with quantum point...
Spin Accumulation and Spin Relaxation in a Large Open Quantum Dot (2008)
Koop, E.J., Wees, B.J. Van, Reuter, D., Wieck, A.D.
We report electronic control and measurement of an imbalance between spin-up and spin-down electrons in micron-scale open quantum dots. Spin injection and detection were achieved with quantum point...
Combinatorial Electrochemistry on Al-Fe Alloys (2008)
Mardare, A. I., Yadav, A. P., Wieck, A. D., Stratmann, M., Hassel, A. W.
Low temperature dephasing in irradiated metallic wires (2007)
Capron, T., Niimi, Y., Baines, Y., Mailly, D., Melnikov, A., ...
We present phase coherence time measurements in quasi-one-dimensional Ag wires implanted with Ag$^{+}$ ions with an energy of $100 keV$. The measurements have been carried out in the temperature...
Hysteretic magnetotransport in p-type AlGaAs heterostructures with In/Zn/Au ohmic contacts (2007)
Grbic, B., Leturcq, R., Ihn, T., Ensslin, K., Blatter, G., Reuter, D., ...
The two-terminal magneto-conductance of a hole gas in C-doped AlGaAs/GaAs heterostructures with ohmic contacts consisting of alloyed In/Zn/Au displays a pronounced hysteresis of the conductance...
Charge and spin dynamics in a two-dimensional electron gas (2007)
Pugžlys, A., Rizo, P.J., Ivanin, K., Slachter, A., Reuter, D., Wieck, A.D., ...
A number of time-resolved optical experiments probing and controlling the spin and charge dynamics of the high-mobility two-dimensional electron gas in a GaAs/AlGaAs heterojunction are discussed....
Koop, E.J., Lerescu, A.I., Liu, J., Wees, B.J. Van, Reuter, D., Wieck, A.D., ...
The conductance of a quantum point contact (QPC) shows several features that result from many-body electron interactions. The spin degeneracy in zero magnetic field appears to be spontaneously lifted...
Scaling of the Low-Temperature Dephasing Rate in Kondo Systems (2006)
Mallet, F., Ericsson, J., Mailly, D., Ünlübayir, S., Reuter, D., Melnikov, A., ...
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Gold nanoparticles growth and their embedding in thin anodic alumina
Mardare, A. I., Borodin, S., Rohwerder, M., Wieck, A. D., Hassel, A. W.