Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HL: Halbleiterphysik
HL 10: Spintronik II
HL 10.4: Vortrag
Freitag, 4. März 2005, 15:45–16:00, TU P270
Spin-orbit coupling and anisotropy of spin splitting — •Jens Könemann1, D. K. Maude2, and R. J. Haug1 — 1Inst. f. Festkörperphysik, Uni Hannover, Appelstrasse 2, D-30167 Hannover, Germany — 2High Magnetic Field Laboratory, CNRS, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble cedex 9, France
In our work we investigate the anisotropy of spin splitting of electrons in quantum dots with respect to different configurations of an applied magnetic field and compare it to the effective Land-factor. We explain our results by an interplay between spin-orbit coupling and quantum dot confinement of the electrons [1]. The spin splitting data for both samples display an anisotropy, i. e. the spin splitting caused by the out-of-plane field (with respect to the quantum well plane) is systematically larger than what is created by the in-plane field. In sample A (strong spatial confinement) we observe for the in-plane field orientation a smaller slope of the linear spin-splitting than for the out-of-plane-magnetic field orientation. In contrary, we find in sample B (weak confinement) the same slope of the splitting for both field orientations, but the out-of-plane field orientation of the spin-splitting dependence has a constant energy offset compared to the spin splitting in the in-plane field orientation. We will show that the anisotropy in spin splitting can be traced back to the spin-orbit coupling effects in the lateral electron motion inside the quantum well and that its values in both samples can be related to the same spin-orbit coupling characteristics.
[1] J. Könemann et al., cond-mat/0409054