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MA: Fachverband Magnetismus

MA 48: Poster: Spintronics (with TT)

MA 48.2: Poster

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

Spin blockade effects in a GaMnAs double quantum dot system — Stefan Geissler¹, •Sebastian Pfaller², Andrea Donarini², Milena Grifoni², and Dieter Weiss¹ — ¹Institute 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.