Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 84: Fluctuations and Noise

TT 84.6: Vortrag

Donnerstag, 15. März 2018, 10:45–11:00, HFT-FT 131

Detection of spin precessions in a quantum-dot spin valve via counting statistics — •Philipp Stegmann, Jürgen König, and Stephan Weiß — Theoretische Physik, Universität Duisburg-Essen and CENIDE, 47048 Duisburg, Germany

We propose to use the full counting statistics of electron transport to reveal spin precessions in a quantum-dot spin valve, i.e., a quantum dot tunnel coupled to two ferromagnets with noncollinear magnetizations. The spin precession has an unique impact on the statistics which can be identified by generalized factorial cumulants [1,2]. Quantities like the current noise, the waiting time distribution, or ordinary cumulants are affected by the spin precession only for strongly spin-polarized ferromagnets. In contrast, our detection scheme succeeds even for arbitrary small polarizations and especially for the experimentally most favored materials [3].
[1] P. Stegmann and J. König, Phys. Rev. B 92, 155413 (2015).
[2] P. Stegmann and J. König, New J. Phys. 19, 023018 (2017).
[3] A. D. Crisan et al., Nat. Commun. 7, 10451 (2016).