Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 4: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 1 (jointly with DY)

TT 4.10: Vortrag

Montag, 16. März 2015, 12:15–12:30, H 0104

The generic fixed point model for pseudo-spin-1/2 quantum dots in nonequilibrium: Spin-valve systems with compensating spin polarizations — Stefan Göttel^1,2, Frank Reininghaus^1,2, and •Herbert Schoeller^1,2 — ¹Institute for Theory of Statistical Physics, RWTH Aachen — ²JARA-Fundamentals of Future Information Technology

We study a pseudo-spin-1/2 quantum dot in the cotunneling regime close to the particle-hole symmetric point. For a generic tunneling matrix we find a generic fixed point with interesting nonequilibrium properties, characterized by effective reservoirs with compensating spin orientation vectors weighted by the polarizations and the tunneling rates. At large bias voltage we study the magnetic field dependence of the dot magnetization and the current. The fixed point can be clearly identified by analysing the magnetization of the dot. We characterize in detail the universal properties for the case of two reservoirs.