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TT: Fachverband Tiefe Temperaturen
TT 26: Nanotubes and Nanoribbons
TT 26.3: Vortrag
Dienstag, 19. März 2024, 10:00–10:15, H 3007
Superconducting vortex diode effect in open nanotubes — Rodrigo H. de Bragança1,2, Igor Bogush2,3, and •Vladimir M. Fomin2,3 — 1Universidade Federal de Pernambuco, Departamento de Física, Centro de Ciências Exatas e da Natureza, 50740-560 Recife, Brasil — 2Leibniz IFW Dresden, IET, 01069 Dresden, Germany — 3Moldova State University, 2009 Chişinău, Republic of Moldova
Due to advances in high-tech roll-up technology and direct-write nanoprinting using focused electron and ion beams, novel complex-geometry 3D nanoarchitectures have been fabricated that provide new tools for controlling vortex motion. We focus on the vortex ratchet effect due to periodic asymmetric pinning potentials, which bias or rectify the vortex motion, in a rolled-up open Nb nanotube of a small thickness with a paraxial slit. It is demonstrated that the nontrivial topology of the screening currents in the open nanotube together with asymmetric pinning centers give rise to a superconducting vortex diode effect. Numerical simulations have provided the current–voltage characteristics and the efficiency of the superconducting diode effect. Vortices move over paths along two narrow channels, where the normal component of the magnetic field is close to maximal. We attribute the high efficiency of the diode effect in the system to the asymmetric pinning centers placed in the narrow channels, where the vortices move. In the system under analysis, we obtain a twice higher resistance for the transport current in one direction than in another one. These results shed light on the perspectives of application of 3D superconducting nanoarchitectures by virtue of the superconducting diode effect.
Keywords: superconductor open nanonubes; superconducting vortices; vortex paths; asymmetric pinning centers; vortex diode effect