Prof. Dr. Michael Oestreich

Leibniz University Hannover Institute for Solid State Physics Department of Nanostructures Appelstrasse 2 D-30167 Hannover

Tel: 0511 762 3493 Fax: 0511 762 2904 Email: oest@nano.uni-hannover.de

Spin dynamics in semiconductors

Understanding, controlling, and utilizing the spin dynamics of electrons and holes in semiconductors is one of the most prominent tasks in today's field of semiconductor spintronics. For a better understanding of the spin dynamics we aim towards the development of a new experimental technique, that allows to measure very fast electron and hole spin dynamics nearly perturbation free. The technique combines spin noise spectroscopy with ultrafast optical pump-probe techniques and will be demonstrated on localized electron spins in high mag- netic fields and subsequently used to study the spin dynamics of holes localized in the weak potential of acceptors. Afterwards, we will study with continuous wave (cw) spin noise spectroscopy the spin dynamics of carriers in the deep confinement potential of single, charge tunable (InGa)As/GaAs quantum dots and demonstrate charge dependent spin noise blockade. Structurally the same quantum dots and later two-dimensional heterostructures will be used to demon- strate that control of the spin orientation by short electrical pulses is feasible. Finally, we will show that the spin orientation can be utilized in a room tem- perature spintronic device by demonstrating the efficient threshold reduction of a vertical cavity surface emitting laser at room temperature.