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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht


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
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.


Wichtige Termine:

15. Sept. 2013:
Deadline für den Sonderband Semiconductor Spintronics (DFG-Abschlussbericht) in physica status solidi b
(nähere Informationen wurden per Email zugeschickt)

30. Sept. - 2. Okt. 2013:
Abschlusstreffen des Schwerpunktprogramms "International workshop on semiconductor spintronics" in der Residenz Würzburg
(nähere Informationen)

Aktuelle Veröffentlichung(en):

C. Drexler, S.A. Tarasenko, P. Olbrich, J. Karch, M. Hirmer, F. Müller, M. Gmitra, J. Fabian, R. Yakimova, S. Lara-Avila, S. Kubatkin, M. Wang, R. Vajtai, P. M. Ajayan, J. Kono, and S.D. Ganichev :  "Magnetic quantum ratchet effect in graphene" Nature Nanotechnology 8, 104 (2013)

J.H. Buß, J. Rudolph, S. Shvarkov, H. Hardtdegen, A.D. Wieck, and D. Hägele:  "Long electron spin coherence in ion‐implanted GaN: The role of localization" Appl. Phys. Lett. 102, 192102 (2013)

D.J. English, J. Hübner, P.S. Eldridge, D. Taylor, M. Henini, R.T. Harley, and M. Oestreich:  "Effect of symmetry reduction on the spin dynamics of (001)-oriented GaAs quantum wells" Phys. Rev. B 87, 075304 (2013)

V.L. Korenev, I.A. Akimov, S.V. Zaitsev, V.F. Sapega, L. Langer, D.R. Yakovlev, Yu. A. Danilov, and M. Bayer:  "Dynamic spin polarization by orientation-dependent separation in a ferromagnet–semiconductor hybrid" Nature Communications 3, 959 (2012)

M. Althammer, E.-M. Karrer-Müller, S.T.B. Goennenwein, M. Opel, R. Gross:  "Spin transport and spin dephasing in zinc oxide" Appl. Phys. Lett. 101, 082404 (2012)