Regensburg 2022 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 36: Quantum Coherence and Quantum Information Systems (joint session TT/DY)

DY 36.11: Talk

Thursday, September 8, 2022, 12:15–12:30, H22

Cavity-mediated superconductor-ferromagnet interaction — Andreas T. G. Janssønn, •Henning G. Hugdal, Arne Brataas, and Sol H. Jacobsen — Center for Quantum Spintronics, Department of Physics, NTNU, Norwegian University of Science and Technology, Trondheim, Norway

We present a microscopic theoretical analysis of interactions between a ferromagnet (FM) and superconductor (SC) mediated by photons in a cavity. This facilitates interactions over macroscopic distances, in contrast with extensively researched FM-SC proximity systems, and ensures there is no interfacial suppression of their respective order parameters. The spatial separation between the materials also means the FM and SC may be held at different temperatures, and has potential applications as a bridge in spintronic-superconducting circuitry. Specifically, we deduce the anisotropy field induced across the FM due to the presence of the SC when the system is subjected to a symmetry-breaking external field. Other quantities such as renormalized dispersion relations can also be deduced. The model is a modification and quantum mechanical extension of the principle presented in Janssøn et al. PRB 102, 180506(R) (2020).