Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Transport: Quantum Coherence and Quantum Information Systems - Theory (jointly with MA, HL)

TT 22.12: Vortrag

Dienstag, 21. März 2017, 12:30–12:45, HSZ 103

Detection of coherent oscillations in proximitized quantum dot spin valves — Philipp Stegmann, Jürgen König, and •Stephan Weiss — Theoretische Physik, Universität Duisburg-Essen and CENIDE, 47048 Duisburg, Germany

Spin coherent oscillations in a proximitized quantum dot spin valve are resolved by means of full counting statistics of electrons [1]. Especially, generalized factorial cumulants [2,3] of the electronic distribution function are suitable for the detection of the transition between different spin states in the system. We furthermore study the influence of a tunnel coupled superconductor. Due to the presence of Andreev reflections, coherent oscillations between different spin states are modified, the Larmor frequency is renormalized. We explore that general factorial cumulants are able to distinguish different fundamental transport processes of the model [1].

[1] Ph. Stegmann, J. König, S. Weiss, submitted (2016)
[2] Ph. Stegmann, J. König, Phys. Rev. B 92, 155413 (2015)
[3] Ph. Stegmann, J. König, Phys. Rev. B 94, 125433 (2016)