Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 2: Nanotubes, Nanoribbons and Graphene

TT 2.3: Talk

Monday, September 5, 2022, 10:00–10:15, H22

Topological transitions in dc+ac-driven superconductor nanotubes — •Vladimir M. Fomin¹ and Oleksandr V. Dobrovolskiy² — ¹Institute for Integrative Nanosciences, Leibniz IFW Dresden, 01069 Dresden — ²Superconductivity and Spintronics Laboratory, Nanomagnetism and Magnonics, Faculty of Physics, University of Vienna, 1090 Vienna

A complex interplay of the patterns of superconducting screening currents with the 3D geometry unveils a plethora of emerging effects in the dynamics of topological defects in curved 3D superconductor nanoarchitectures [1]. We discuss topological transitions in the dynamics of vortices and slips of the phase of the order parameter in open superconductor nanotubes under a modulated dc+ac transport current [2]. Relying upon the time-dependent Ginzburg-Landau equation, we reveal two voltage dynamics regimes. The first regime with a pronounced first harmonic in the FFT spectrum of the induced voltage occurs when the dominant area of the open tube is in the superconducting or normal state. The second regime entails a rich FFT spectrum of the induced voltage because of the complex interplay between the dynamics of vortices/phase slips and the screening currents. Our findings represent novel dynamical states in superconductor open nanotubes, in particular, paraxial and azimuthal phase-slip regions, their branching and coexistence with vortices, and allow for their control by superimposed dc+ac current stimuli.

[1] V. M. Fomin, O. V. Dobrovolskiy, Appl. Phys. Lett. 120, 090501 (2022)

[2] V. M. Fomin, R. O. Rezaev, O. V. Dobrovolskiy, Scientific Reports 12, accepted (2022)