2009/04/20 by Michael Dreyer, Jonghee Lee, Dreyer, Michael +5
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #physics.comp-ph
paper · pdf · doi:10.48550/arxiv.0904.3082
6 pages, 11 figures
arxiv created 2009/04/20 · openalex publication_date 2009/04/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We designed and implemented our own versatile simulation software in order to understand the velocity changes and track patterns observed in slow moving vortex lattices. The data was obtained from time series of STM images on NbSe2 in a magnetic field range of 250-750 mT. The main thrust is to explore possible driving mechanism and to test the effect of various defect configuration on vortex velocity and tracks. The simulation uses the full vortex--vortex and vortex--defect interaction. It allows for periodic boundary conditions as well as a repulsive sample edge. In early versions the time intervals for recalculating the force were estimated for individual vortices. This, however, led to a positional 'noise' of unacceptable temperature of the vortex lattice and was hence replaced by a global time step control. We were able to produce similar track and velocity patterns as well as local lattice distortions near point defects as observed by STM. A detailed analysis is, however, beyond the scope of this paper.