SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Poster: Superconductivity I

TT 57.16: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2

RKKY interaction in non-centrosymmetric superconductors — •Finja Tietjen and Jacob Linder — Department of Physics, Center for Quantum Spintronics, Norwegian University of Science and Technology, 7491, Trondheim, Norway

Recent advances in experimental studies have raised interest in how spin interactions are manifested in unconventional superconductors, which can potentially be used for spintronic devices. In particular, superconducting triplet states featuring spin-polarized Cooper pairs are expected to qualitatively alter spin interaction compared to non-superconducting materials.

We consider the RKKY-interaction between two impurity spins in a non-centrosymmetric superconductor. Such superconductors feature antisymmetric spin-orbit coupling and, generally, coexisting singlet and triplet Cooper pairs. The RKKY-interaction is treated perturbatively with a Schrieffer-Wolff transformation within the Bogoliubov-de Gennes framework. Exact numerical studies complement the analytical approach and show local decreases in the total superconducting gap as well as a change in local density of states at impurity sites. The RKKY interaction is affected by the superconductor and the corresponding change in the ground-state spin configuration is also clearly visible. We expect that the spin configuration can thus be externally controlled by entering or leaving the superconducting state.

Ongoing studies on the exact dependencies as well as advances in the analytical approach promise further insights closer to the conference date.