Version 1
: Received: 27 August 2024 / Approved: 27 August 2024 / Online: 28 August 2024 (10:47:52 CEST)
How to cite:
Skog, A.; Hovhannisyan, R. A.; Krasnov, V. M. Numerical Modelling of Vortex-Based Superconducting Memory Cells: Dynamics and Geometrical Optimization. Preprints2024, 2024082020. https://doi.org/10.20944/preprints202408.2020.v1
Skog, A.; Hovhannisyan, R. A.; Krasnov, V. M. Numerical Modelling of Vortex-Based Superconducting Memory Cells: Dynamics and Geometrical Optimization. Preprints 2024, 2024082020. https://doi.org/10.20944/preprints202408.2020.v1
Skog, A.; Hovhannisyan, R. A.; Krasnov, V. M. Numerical Modelling of Vortex-Based Superconducting Memory Cells: Dynamics and Geometrical Optimization. Preprints2024, 2024082020. https://doi.org/10.20944/preprints202408.2020.v1
APA Style
Skog, A., Hovhannisyan, R. A., & Krasnov, V. M. (2024). Numerical Modelling of Vortex-Based Superconducting Memory Cells: Dynamics and Geometrical Optimization. Preprints. https://doi.org/10.20944/preprints202408.2020.v1
Chicago/Turabian Style
Skog, A., Razmik A. Hovhannisyan and Vladimir M. Krasnov. 2024 "Numerical Modelling of Vortex-Based Superconducting Memory Cells: Dynamics and Geometrical Optimization" Preprints. https://doi.org/10.20944/preprints202408.2020.v1
Abstract
The lack of dense random-access memory is one of the main obstacles to the development of digital superconducting computers. It has been suggested that AVRAM cells, based on the storage of a single Abrikosov vortex — the smallest quantized object in superconductors — can enable drastic miniaturization to the nanometer scale. In this work, we present numerical modeling of such cells using time-dependent Ginzburg-Landau equations. The cell represents a fluxonic quantum dot containing a small superconducting island, an asymmetric notch for vortex entrance, a guiding track, and a vortex trap. We determine the optimal geometrical parameters for operation at zero magnetic field and the conditions for controllable vortex manipulation by short current pulses. We report ultra-fast vortex motion with velocities more than an order of magnitude faster than those expected for macroscopic superconductors. This phenomenon is attributed to strong interactions with the edges of a mesoscopic island, combined with the nonlinear reduction of flux-flow viscosity due to nonequilibrium effects in the track. Our results show that such cells can be scaled down to sizes comparable to the London penetration depth, ∼100 nm, and can enable ultrafast switching on the picosecond scale with ultra-low energy per operation, ∼10−19 J.
Keywords
Josephson effect; superconductivity; digital electronics; nano-devices
Subject
Physical Sciences, Applied Physics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
