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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
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Prof. Dr. Peter Vogl

Technische Universität München
Walter Schottky Institut
Am Coulombwall 3
85748 Garching

Tel.:089 / 289 12750
Fax:089 / 289 12737
Microscopic theory of spin-splittings and ballistic spin currents in semiconductor nanostructures

This project aims at predicting ultimate limits of spin-orbit induced magnetizations, intrinsic spin precession times, and spin-polarized ballistic electron currents in two-dimensional electron gases. Our theoretical approaches are based on a combination of ab-initio and semiempirical electronic structure methods, a spin-dependent ballistic quantum transport theory and a sophisticated non-equilibrium Green's function approach for open quantum devices. In close collaboration with several experimental groups in this priority program, we will study the dependence of spin-splittings near conduction and valence subband edges on material composition, confinement, strain, doping, and applied electric fields, and use these detailed results to predict Haas-van Alphen and Shubnikov-de-Haas spectra for III-V heterostructures, superlattices and HFET structures. In addition, we calculate ballistic charge and spin currents as a function of applied bias and magnetic fields in laterally confined InAs/GaSb/GaAs-based ballistic electron systems and design structures that can produce spin-polarized electrons by spin-selective scattering off interfaces, barriers and constrictions.


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)