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Schwerpunktprogramm SPP 1285
Halbleiter Spintronik
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Prof. Dr. Jan von Delft

Physik Department
Arnold Sommerfeld Center and Center for NanoScience
Ludwig-Maximilians-Universität München
Theresienstr. 37/III
80333 München

Prof. Dr. Yuval Gefen

Department of Condensed Matter Physics
TheWeizmann Institute of Science
Rehovot 76100

Spin-dependent transport through multi-level quantum dots in phase-coherent and/or nonequilibrium conditions

We plan to study spin-dependent transport through multi-level quantum dots under phase-coherent and/or nonequilibrium conditions, aiming to achieve a unified description of both few- and many-level quantum dots. For quantum dots, the interplay of spin and Coulomb charging effects leads to a rich but complex set of phenomena. We will study (A) phase-coherent transport for dots embedded in Aharonov-Bohm interferometers, and (B) steady-state nonequilibrium transport for dots connected to two leads at different chemical potentials. A combination of numerical and analytical methods will be used: Jan von Delft (JvD) will focus on quantum dots with comparatively large level spacings (modeled by few-level Anderson impurity models), mainly using numerical matrix-product-state methods. Yuval Gefen (YG) will pursue analytical studies (based on the so-called universal Hamiltonian), mainly using a non-Abelian effective action that describes spin-charge correlations beyond a mean-field level. The results of this method will be checked against the numerical results of JvD for few-level models, but it also applies to many-level dots. By combining both approaches, we will thus achieve a unified description of both few- and many-level models.


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)