Vortex shells in mesoscopic triangles of amorphous superconducting thin films

Kokubo, N.; Miyahara, Hajime; Okayasu, Satoru; Nojima, Tsutomu

doi:10.1016/j.physc.2016.05.009

Cited by 4 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These effects have been observed e.g. in grains shaped like discs, 3,19,21 squares, 21,52,[82][83][84][85] triangles, 21,[86][87][88][89] and pentagons. 90 Such scenarios are great examples of when a sufficiently sophisticated simulation tool like SuperConga is crucial, since one needs to capture the combined effects of a confined geometry and a finite penetration depth with back-coupling of the induction.…”

Section: Demonstration Of Supercongamentioning

confidence: 95%

“…In particular, the number of vortices and their separation do not only depend on the external field strength, but also on the geometry, the nature of boundaries, and the relation between system size and superconducting length scales, i.e., the coherence length and the penetration depth. This problem has attracted considerable interest both theoretically and experimentally during the last years 3,[19][20][21]52,[82][83][84][85][86][87][88][89][90] .…”

Section: Spectroscopy On Superconducting Nanostructuresmentioning

confidence: 99%

See 1 more Smart Citation

SuperConga: an open-source framework for mesoscopic superconductivity

Holmvall¹,

Wennerdal²,

Håkansson³

et al. 2022

Preprint

View full text Add to dashboard Cite

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.

show abstract

Section: Demonstration Of Supercongamentioning

confidence: 95%

Section: Spectroscopy On Superconducting Nanostructuresmentioning

confidence: 99%

SuperConga: an open-source framework for mesoscopic superconductivity

Holmvall¹,

Wennerdal²,

Håkansson³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Those configurations are so sensitive to sample shape that even a slight deformation can transform them to other asymmetric configurations [20]. In equilateral triangles [22][23][24], the triangular symmetry shares the same symmetry as the Abrikosov vortex lattice. Therefore, triangular lattices are formed at commensurate vorticities.…”

Section: Introductionmentioning

confidence: 99%

Finite-size and shape effects on vortex configurations in superconducting isosceles right triangles

Wu¹,

Zhao²,

Li³

et al. 2017

Supercond. Sci. Technol.

View full text Add to dashboard Cite

We numerically studied vortex configurations in superconducting isosceles right triangles. We found the solution of the London equation using Green’s function method. Then the Gibbs free energy for an arbitrary configuration was obtained. Using molecular dynamic simulation, we calculated the stable configurations for specific vorticities. The filling rulers were revealed by analyzing these states. Moreover, by changing the sample size, we found that many configurations are sensitive to sample size, which shows a very strong size effect. Lastly, general rules of the size effect were summarized.

show abstract

SuperConga: An open-source framework for mesoscopic superconductivity

Holmvall

Wennerdal

Håkansson

et al. 2023

Applied Physics Reviews

View full text Add to dashboard Cite

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 temperatures. 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 graphics processing units. 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 (LDOS), and 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 bound-states, 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.

show abstract

Vortex shells in mesoscopic triangles of amorphous superconducting thin films

Cited by 4 publications

References 14 publications

SuperConga: an open-source framework for mesoscopic superconductivity

SuperConga: an open-source framework for mesoscopic superconductivity

Finite-size and shape effects on vortex configurations in superconducting isosceles right triangles

SuperConga: An open-source framework for mesoscopic superconductivity

Contact Info

Product

Resources

About