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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht

Projekt

Ansprechpartner1
Dr. Tamara Nunner
Adresse1

Institut für Theoretische Physik
Freie Universität Berlin
Arnimallee 14
14195 Berlin

Tel.:
Tel.:(030) 838-53797
Fax:
Fax:(030) 838-56799
Ansprechpartner2
Prof. Dr. Felix v. Oppen
Adresse2

Institut für Theoretische Physik
Freie Universität Berlin
Arnimallee 14
14195 Berlin

Tel.:
Tel.:(030) 838-53036
Fax:
Fax:(030) 838-56799
Projekttitel
Spin transport and relaxation
Projektbeschreibung

Spin transport over relevant distances poses one of the major challenges in the field of spintronics. The underlying reason is that unlike charge currents, spin currents are not conserved. It is therefore of crucial importance to understand their decay mechanisms. In this respect, the effects of spin-orbit interaction have been rather well studied. By contrast, much less attention has been paid to the effects of electronelectron interaction and magnetic scattering. Electron-electron interactions can lead to decay of spin currents by transferring momentum between the two spin species. This phenomenon, referred to as spin Coulomb drag, has recently been observed experimentally for the first time. We propose to set up a theory for the spin Coulomb drag in materials with bulk spinorbit interaction, we will investigate spin Coulomb drag in the presence of spin-flip scattering, and we intend to study how spin Coulomb drag affects both the spin Hall and the anomalous Hall effects. Magnetic scattering has been found to promote spin transport in a two-dimensional electron gas with spin-orbit interaction. We propose to investigate the effects of spin-flip scattering and spin-dependent scattering on spin-polarized transport in systems where magnetic impurities are constitutive such as the magnetic two-dimensional electron gas and diluted magnetic semiconductors.

Zurück

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)