Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 97: Superconducting Diodes and Ratchets

TT 97.8: Vortrag

Freitag, 13. März 2026, 11:30–11:45, CHE/0089

Tunable Nonreciprocity in 3D Superconductor Nanoarchitectures — •Igor Bogush and Oleksandr Dobrovolskiy — Cryogenic Quantum Electronics, EMG and LENA, Technische Universität Braunschweig, Germany

Nonreciprocity lies at the heart of superconducting diodes and ratchets, key elements for designing low-dissipative computing devices [1]. However, achieving precise control over the directionality and strength of nonreciprocity is challenging, as it requires local tuning of superconductor properties or applied stimuli. Here, we show that the geometry of curved thin superconductor membranes introduces a new degree of freedom, enabling vortex-motion synchronization [2] and nonreciprocity tunable via the magnetic field direction. In such membranes, only the component of the magnetic field normal to the surface exerts a driving Lorentz force on vortices, while the tangential component is less relevant. Using a conformal approach for time-dependent Ginzburg-Landau simulations [3], we predict that in cap-shaped superconductor membranes, the magnetic field induces effective pinning whose location can be controlled by adjusting the field direction. Even without a pinning potential, this controllable symmetry breaking induces nonreciprocal vortex dynamics and vortex ratchet behavior. These results highlight the geometry in thin curved membranes as a parameter that enhances the tunability of superconducting phenomena in rectifiers and other fluxonic devices.
[1] Plourde, IEEE Trans. Appl. Supercond. 19 (2009) 3698
[2] Bogush et al., Phys. Rev. B 111 (2025) 214510
[3] Bogush et al., Comp. Phys. Comm. 315 (2025) 109736

Keywords: superconductivity; vortex dynamics; 3D geometry; TDGL; fluxonics