Flux Qubit Based on Hybrid Ferromagnetic-Superconducting Device

Rybakov, Filipp N.; Babaev, Egor

doi:10.48550/arxiv.2203.08752

Cited by 1 publication

(2 citation statements)

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“…To the best of our knowledge, SuperConga is the only open-source code that uses quasiclassical theory to describe mesoscopic superconducting grains and ballistic devices. It therefore adds the missing "mesoscopic link" between more phenomenological methods, such as London-Maxwell 129 and Ginzburg-Landau, 111,130,131 and fully microscopic methods, such as density-functional theory [132][133][134][135][136] and tight-binding approaches. [137][138][139][140] This paper outlines the functionality of version 1.0 of Su-perConga.…”

Section: Discussionmentioning

confidence: 99%

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SuperConga: an open-source framework for mesoscopic superconductivity

Holmvall¹,

Wennerdal²,

Håkansson³

et al. 2022

Preprint

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We present SuperConga, an open-source framework for simulating equilibrium properties of unconventional and ballistic singlet superconductors, confined to two-dimensional (2D) mesoscopic grains in a perpendicular external magnetic field, at arbitrary low temperature. It aims at being both fast and easy to use, enabling research without access to a computer cluster, and visualization in real-time with OpenGL. The core is written in C++ and CUDA, exploiting the embarrassingly parallel nature of the quasiclassical theory of superconductivity by utilizing the parallel computational power of modern GPUs. The framework self-consistently computes both the superconducting order-parameter and the induced vector potential, and finds the current density, free energy, induced flux density, local density of states, as well as the magnetic moment. A user-friendly Python frontend is provided, enabling simulation parameters to be defined via intuitive configuration files, or via the command-line interface, without requiring a deep understanding of implementation details. For example, complicated geometries can be created with relative ease. The framework ships with simple tools for analyzing and visualizing the results, including an interactive plotter for spectroscopy. An overview of the theory is presented, as well as examples showcasing the framework's capabilities and ease of use. The framework is free to download from https://gitlab.com/superconga/superconga, which also links to the extensive user manual, containing even more examples, tutorials and guides.To demonstrate and benchmark SuperConga, we study the magnetostatics, thermodynamics, and spectroscopy of various phenomena. In particular, we study flux quantization in solenoids, vortex physics, surface Andreev boundstates, and a "phase crystal". We compare our numeric results with analytics, and present experimental observables, e.g. the magnetic moment and LDOS, measurable with for example scanning-probes, STM and magnetometry.

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Section: Discussionmentioning

confidence: 99%

“…One possible physical realization of this gauge would be to let the superconducting annulus encircle a strong magnet. 111 Using the gauge transformation Eq. ( 28) we can impose a phase winding in the order-parameter field going around the annulus.…”

Section: (C) the Area Of The Annulus Ismentioning

confidence: 99%