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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
Spintronik > Projekte > Projektansicht

Projekt

Ansprechpartner1
Prof. Dr. Gerd Schön
Adresse1

Institut für Theoretische Festkörperphysik
Universität Karlsruhe
76128 Karlsruhe

Tel.:
Tel.:(0721) 608 3361
Fax:
Fax:(0721) 608 7040
Ansprechpartner2
Dr. Alexander Shnirman
Adresse2

Institut für Theoretische Festkörperphysik
Universität Karlsruhe
76128 Karlsruhe

Tel.:
Tel.:(0721) 608 6030
Fax:
Fax:(0721) 608 7040
Ansprechpartner3
Dr. Pablo San-Jose
Adresse3

Institut für Theoretische Festkörperphysik
Universität Karlsruhe
76128 Karlsruhe

Fax:
Fax:(0721) 608 7040
Tel.:
Tel.:(0721) 608 7671
Projekttitel
Effects of spin-orbit interaction and geometric phases on quantum coherent spin transport and spin manipulations in semiconductor quantum dots and devices
Projektbeschreibung

We propose to study quantum coherent spin transport and spin dynamics in semiconduct-ing quantum dots, multi-dot systems, and devices under the influence of spin-orbit interac-tion and geometric phases. Specifically we plan to investigate three subprojects: (i) We will explore how these effects can be used to control the quantum gates needed for spin-based quantum information processing purely by means of ac electric fields applied to the quantum dots. (ii) We will investigate the influence of spin-orbit interaction on geometric relaxation and decoherence processes at low magnetic fields pointing in arbitrary direction, as well as multipolar contributions at high fields, and we want to explore strategies to enhance the coherence time, e.g., by exploiting motional narrowing. (iii) We will study spin-dependent higher order correlated tunneling processes, an example being provided by the Kondo effect in transport through systems where a quantum dot is in contact with ferromagnetic electrodes. We plan to study the influence of spin textures arising due to spin-orbit interaction on the transport characteristics as well as the interplay of spin and orbital degrees of freedom in multi-dot systems. Much of our theoretical work is motivated by recent and ongoing experiments.

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)