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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
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Prof. Dr. Gernot Güntherodt

RWTH Aachen
II. Physikalisches Institut
52056 Aachen

Coherent electrical spin injection and detection across ferromagnet-semiconductor interfaces

We propose to perform time- and spatially-resolved studies of coherent spin currents in n-doped semiconductors. In a first focus, we will use ultrafast current pulses to inject electron spins from a ferromagnet into a semiconductor. We have recently demonstrated the coherence of this electrical spin injection process by the detection of subsequent spin precession in the semiconductor using phase-sensitive time-resolved MOKE as a probe. Spin dephasing and spin transport times as well as the role of hot carrier relaxation during the injection process shall be investigated with this technique. We suggest extending this method to lateral devices which have ferromagnetic source and drain contacts to obtain spatio-temporal maps of the coherent spin currents with both spin and phase information in order to extract spin diffusion and accumulation times and length. In a second focus, we propose to explore methods for timedomain electrical detection schemes for coherent spin transport from the semiconductor back into the ferromagnet.


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)