Berlin 2015 – scientific programme

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MA: Fachverband Magnetismus

MA 45: Spin-dependent Transport Phenomena II

MA 45.10: Talk

Thursday, March 19, 2015, 17:30–17:45, H 0112

The influence of Coulomb interactions on spin-dependent thermoelectric transport through double quantum dot system with Rashba spin-orbit coupling — •Łukasz Karwacki and Piotr Trocha — Faculty of Physics, Adam Mickiewicz University, Poznań, Poland

We investigate theoretically a double quantum dot system embedded into an Aharonov-Bohm ring and coupled to two electronic reservoirs. The magnetic potential present in the system due to the Aharonov-Bohm device leads to spin-independent phase factors in terms related to coupling between the dots and the electrodes. Furthermore, we assume additional spin-dependent phase factors arising from Rashba spin-orbit interaction. We show the influence of the aforementioned phases and that of the Coulomb blockade on the dots on such basic thermoelectric parameters as charge and spin conductances, electronic contribution to heat conductance, charge and spin thermopower and the resulting thermoelectric effectiveness factor.

In our approach we focus on the linear response regime, where the thermoelectric parameters are functions of transmission coefficient. To derive this coefficient we employ equation of motion for non-equilibrium Green’s function method.

The results indicate a possibility for an efficient spin-dependent Seebeck generator. Tuning the Rashba spin-orbit interaction leads to pure spin current through the system. In both cases Coulomb blockade leads to enhancement of thermoelectric transport.