Speaker
Description
Studies of rectified transport in systems lacking reflection symmetry (ratchets) have been a subject of sustained interest for many decades [1]. In recent years, the superconducting diode effect has attracted considerable attention, both for enabling rectification without Joule heating in low-power electronics and as a manifestation of broken reciprocity in coherent quantum condensates [2,3]. In this talk, I will present our recent results on nonreciprocal transport in superconductor-based systems, achieved through the engineering of edge barriers [4] and their extension into 3D nano-architectures [5]. Particular emphasis will be placed on giant nonreciprocity in superconductor-ferromagnet heterostructures, where magnetic flux quanta (Abrikosov vortices, or fluxons) interact with propagating spin excitations (spin waves, or magnons) in adjacent magnetically ordered media [6], allowing for their detection and generation [7].
[1] R. Feynman, The Feynman Lectures on Physics, 1 (1963) 46.
[2] F. Ando et al, Observation of superconducting diode effect, Nature 584 (2020) 373.
[3] B. Pal et al, Josephson diode effect from Cooper pair momentum, Nat. Phys. 18 (2022) 1228.
[4] F. Porrati et al, Vortex ratchet effect in a NbC strip with a periodic edge indentation, Small Methods e01430 (2025).
[5] I. Bogush et al, Vortex ratchet effect in superconductor open nanotubes and 3D nanoflakes, Rap. Res. Lett. 2500139 (2025).
[6] O. Dobrovolskiy et al, Magnon-fluxon interaction in a ferromagnet/superconductor heterostructure, Nat. Phys. 15 (2019) 477.
[7] O. Dobrovolskiy et al, Moving Abrikosov vortex lattices generate sub-40 nm magnons, Nat. Nanotechn. 20 (2025) 1764.