Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 106: Poster: Spintronics (with MA/O)

HL 106.2: Poster

Donnerstag, 3. April 2014, 17:00–20:00, P1

Spin blockade effects in a GaMnAs double quantum dot systemStefan Geissler1, •Sebastian Pfaller2, Andrea Donarini2, Milena Grifoni2, and Dieter Weiss11Institute for Exp. and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

Spin polarized transport measurements of a double quantum dot defined in a GaMnAs nano constriction are presented. In the experimental setup, the polarization of the leads as well as of the quantum dot system can be controlled by an external magnetic field. In presence of a magnetic field, differential conductance measurements show a gap opening in the charge stability diagrams, that can be explained by spin blockade effects. Transport calculations of metallic quantum double dots coupled to spin polarized leads show excellent agreement with experimental data.

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