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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht


Dr. Paulo V. Santos

Paul-Drude-Insütut für Festkörperelektronik
Hausvogteiplatz 5-7
10117 Berlin

Tel.:(030) 203 77 22
Fax:(030) 203 77 515
Dr. Rudolf Hey

Paul-Drude-Insütut für Festkörperelektronik
Hausvogteiplatz 5-7
10117 Berlin

Tel.:(030) 203 77 35
Fax:(030) 203 77 201
Spin transport and manipulation in GaAs (110) quantum wells using surface acoustic waves

The spatial potential modulation induced by a surface acoustic wave (SAW) in semiconductor structures provides an effective way of transporting charge and spins in GaAs quantum wells. The type-II potential modulation spatially separates electrons and holes, thus extending the recombination lifetime and transporting the carriers at the SAW velocity. We have recently demonstrated that the electron-hole separation also reduces the exchange interaction between photoexcited electrons and holes, thus prolonging their spin lifetimes. [1, 2] Furthermore, the confinement by the piezoelectric field reduces spin scattering during transport, thus leading to very long (> 20 ns) spin lifetimes and transport lengths (> 100 ^m). [3, 4] This projects aims at long coherent spin transport lengths at high temperatures (up room temperatures (RT)) by combining the transport by acoustic fields with the special symmetry of GaAs (110) QWs. Emphasis will be placed on the growth of GaAs (110) structures, the generation of strong acoustic fields for efficient spin transport as well as on basic studies and control of the spin dynamics using electric, magnetic, and strain fields. The new concepts introduced here will open new perspectives for applications in spintronic devices.


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)