Regensburg 2019 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunneling and Josephson Junctions
TT 55.10: Talk
Thursday, April 4, 2019, 12:00–12:15, H23
Phase-controlled triplet correlations and thermoelectric effects in a hybrid superconductor-ferromagnet device — •Ali Rezaei1, Robert Hussein1, Akashdeep Kamra2, and Wolfgang Belzig1 — 1Department of Physics, University of Konstanz, Germany — 2Center for Quantum Spintronics, Department of Physics, NTNU, Norway
We study charge and heat transport in superconductor-ferromagnet (S/FM) hybrid structures. Firstly, we analyse a bilayer tunnel junction consisting of a spin-split superconductor connected to a spin-polarized ferromagnet and find that spin-flip scattering strongly enhances the thermoelectric response of the system at low temperature and spin-splitting [1]. A large spin-splitting is also obtainable by employing an antiferromagnetic insulator (AFMI) adjacent to a superconductor in an S|AFMI device [2]. The advantage of using AFMs is the minimization of stray magnetic fields which normally accompany ferromagnets. Finally, we investigate the effects of spin-polarized quasiparticles and spin-mixing on the thermoelectric transport properties of a four-terminal hybrid device incorporating two superconductors which are connected to two ferromagnetic leads via a common central normal node. This geometry allows us to induce phase- and voltage-controlled triplet correlations, and to change the direction of the spin-currents.
[1] A. Rezaei, A. Kamra, P. Machon, and W. Belzig, New J. Phys. 20, 073034 (2018)
[2] Akashdeep Kamra, Ali Rezaei, Wolfgang Belzig, arXiv:1806.10356 (2018); accepted in PRL