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HL: Fachverband Halbleiterphysik

HL 34: Quantum dots and wires: Theory

HL 34.5: Talk

Tuesday, March 12, 2013, 10:30–10:45, H15

Limit Cycles and Chaos in the Current Through a Quantum Dot — •Carlos López-Monís^1,2, Clive Emary³, Gerold Kiesslich³, Gloria Platero², and Tobias Brandes³ — ¹Institute für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — ²Institute für Theoretische Physik, TU Berlin, DE-10623 Berlin, Germany — ³Instituto de Ciencia de Materiales de Madrid, CSIC, ES-28049 Madrid, Spain

In this talk I shall discuss, nonlinear magnetotransport through a single-level quantum dot coupled to ferromagnetic leads, where the electron spin is coupled to a large, external (pseudo)spin via an anisotropic exchange interaction. We find regimes where the average current through the dot displays self-sustained oscillations that reflect the limit cycles and chaos and map the dependence of this behavior on magnetic field strength and the tunnel coupling to the external leads.

C. López-Monís, C. Emary, G. Kiesslich, G. Platero and T. Brandes, Phys. Rev. B. 85, 045301 (2012).