Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Quantum dots and wires: Transport properties II

HL 24.8: Vortrag

Dienstag, 27. März 2007, 16:00–16:15, H15

Multiple Transitions of the Spin Configuration in Quantum Dots — •Maximilian C. Rogge, C. Fühner, and R. J. Haug — Institut für Festkörperphysik, Universität Hannover, Appelstr. 2, 30167 Hannover

We have found multiple transitions of the spin configuration in a lateral quantum dot in high magnetic fields reflecting a sort of Hund’s rule. These transitions are detected in a combined spin blockade/Kondo effect chessboard pattern. Both effects show well known patterns of periodic features with equal periodicity. The transitions of the spin configuration appear either as a swap of the spin blockade pattern or as a swap in the Kondo pattern. These swaps reflect a change of the spin configuration at the edge of the two-Landau-level quantum dot with increasing electron number. A change of the spin polarization back and forth is observed rather than a continuously increasing spin polarization.

[1] M. C. Rogge, C. Fühner, R. J. Haug, Phys. Rev. Lett. 97, 176801 (2006)