Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 42: Transport: Fluctuations and Noise (joint session TT, CPP, DY)

CPP 42.2: Vortrag

Mittwoch, 18. März 2015, 11:45–12:00, H 3005

Waiting time-distribution of a quantum-dot spin valve — •Björn Sothmann — Département de Physique Théorique, Université de Genève, Genève, Switzerland

Recently, the study of waiting-time distributions of electron transport has received a lot of interest [1]. It can provide information about transport processes that is complementary to average current and noise. Here, we discuss the waiting-time distribution of a a quantum-dot spin valve [2], i.e., a single-level quantum dot coupled to two ferromagnetic electrodes with magnetizations that can point in arbitrary directions [3]. We demonstrate that the rich transport physics of this setup, such as the dynamical channel blockade and spin precession in an interaction-driven exchange field, shows up in the waiting-time distribution, and we analyze the conditions necessary to observe the various effects.

[1] M. Albert, G. Haack, C. Flindt, M. Büttiker,

Phys. Rev. Lett. 108, 186806 (2012).

[2] B. Sothmann, Phys. Rev. B 90, 155315 (2014).

[3] M. Braun, J. König, J. Martinek,

Phys. Rev. B 70, 195345 (2004).