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TT: Fachverband Tiefe Temperaturen

TT 21: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 21.12: Talk

Tuesday, March 27, 2012, 12:30–12:45, BH 334

Spin-active scattering in ferromagnet-quantum dot-superconductor junctions — •Henning Soller — Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, D-69120 Heidelberg

Based on the Hamiltonian formalism we study spin-active scattering in a ferromagnet-quantum dot-superconductor junction. Compared to simple tunnel contacts quantum dot junctions exhibit a strongly energy-dependent transmission that is further affected by the presence of the ferromagnetic correlations and on-site Coulomb interaction on the dot. We derive an effective model for a quantum dot in an even charge state. We find a qualitatively new subgap conductance feature related to spin-active scattering and compare our findings to recent experimental results.