SKM 2023 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 3: Superconductivity: Properties and Electronic Structure

TT 3.12: Talk

Monday, March 27, 2023, 12:30–12:45, HSZ 103

Frequency-locking effect in Nb open nanotubes — Igor Bogush^1,2, Oleksandr V. Dobrovolskiy³, and •Vladimir M. Fomin^1,2 — ¹Institute for Integrative Nanosciences (IIN), Leibniz IFW Dresden, D-01069 Dresden, Germany — ²Department of Theoretical Physics, Moldova State University, MD-2009 Chişinău, Republic of Moldova — ³University of Vienna, Faculty of Physics, Nanomagnetism and Magnonics, Superconductivity and Spintronics Laboratory, 1090 Vienna, Austria

We study alternating voltage generation in Nb open nanotubes under weakly modulated transport current and magnetic field by numerically solving the time-dependent Ginzburg-Landau equation [1]. Under stationary currents and fields, as a rule, an alternating voltage with a fixed frequency is generated in the nanotube. The frequency is associated with the period of the vortex nucleation at the nanotube edges. If the transport current is modulated by a weak ac component with a frequency close to the nucleation frequency, we reveal the effect of frequency-locking of the vortex nucleation, i.e., the nucleation frequency becomes equal to the external frequency of the modulated transport current. The frequency-locking width is discussed as a function of the modulation depth. Its sensitivity to the magnetic field variation opens up opportunities for the experimental examination of the effect.
[1] I. Bogush and V. M. Fomin, Phys. Rev. B 105, 094511 (2022)