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Associated Projects

A [1] [2] [3] [4] [5] [6] [7]     B [1] [2] [3] [4] [6] [7]     C [1] [2] [3] [5] [6] [7] [8]     Z [1] [2]     a [A8] [B5] [C4]

 

a-A8 Optical manipulation and detection of strongly coupled spin pairs

Principal investigators:

Summary:

The indium donor system in ZnO provides a unique system of a 10 level nuclear spin that is strongly coupled the donor electron spin. We seek for an experimental recipe for creating specific nuclear non-classical quantum states like squeezed states via optical spin pumping of the electron spin and hyperfine interaction. Time-resolved Kerr-rotation spectroscopy will be used to investigate the coherent interaction of the spin pair. Pump pulse modulation of up to 8 MHz will be used to demonstrate the strong influence of the pumped electron spin on the nuclear spin state.

 

a-B5 Modelling magnetism of diluted magnetic systems

Principal investigators:

Summary:

The unusual magnetic and magneto-optical properties of Mn based dilute magnetic semi-conductors are described by effective spin models of Kondo and Heisenberg type. Their interaction parameters are obtained from supercell calculations using multi-band Gutz-willer theory combined with density functional theory methods. This approach allows one to describe the many-body nature of the localized Mn++ open shell 3d-states embedded into standard free-electron-like energy bands of II-VI and III-V semiconductors. To study the spin models, we will use a Monte Carlo approach combined with other numerical and analytical techniques.

 

a-C4 Magnetic Nanoparticles

Principal investigators:

Summary:

For almost any possible application of magnetic clusters they have to be deposited on a surface or embedded in a matrix. In a first step, size selected ferromagnetic clusters will be synthesized. Next, local polarization-resolved magneto-photoluminescence spectroscopy will be used to study the influence of the cluster magnetic fields on the emission from semiconductor quantum wells. Magneto-optical Kerr-effect measurements provide complementary information. The possibility of zero-dimensional exciton confinement by the magnetic fields concentrated on local positions, which are produced by larger ferromagnetic clusters with several thousands of atoms, will be investigated.



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ICRC - TRR 160
Katharina Sparka
Technische Universität Dortmund
Otto-Hahn-Straße 4a
D-44227 Dortmund
Germany

 

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Phone +49 (0)231 755 2041
Fax +49 (0)231 755 3674

 

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