Parallel Computations of Vortex Core Structures in Superconductors
Ladda ner
Typ
Examensarbete för masterexamen
Master Thesis
Master Thesis
Program
Publicerad
2011
Författare
Wennerdal, Niclas
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In this master thesis the properties of an isolated vortex of flux quantum one in $s$-wave superconductors is investigated. This is done by solving the Eilenberger transport equation for the quasi-classical Matsubara propagator in the extreme clean limit. The local density of states (LDOS) in the vortex center is calculated and the Kramer-Pesch effect is demonstrated. Furthermore, the self-consistency equation for the order parameter, the LDOS and the current calculations have large amounts of data parallelism. By programming in CUDA C this parallelism is exploitable. Parallel computations are carried out on an NVIDIA graphics card giving speedups up to a factor of 100 for small systems and 10 for large ones, compared to serial code, thus showing the immense power of parallelizing calculations and moving them to the graphics card.
Beskrivning
Ämne/nyckelord
Nanovetenskap och nanoteknik , Kritiska fenomen (fasövergångar) , Lågtemperaturfysik , Nanoscience & Nanotechnology , "Critical phenomena (phase transitions);" , Low temperature physics