Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0κ junctions
Goldobin, E. and Susanto, H. and Koelle, D. and Kleiner, R. and Gils, S.A. van (2005) Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0κ junctions. Physical Review B: Condensed matter and materials physics, 71 (10). p. 104518. ISSN 10980121

PDF
521kB 
Abstract:  We investigate theoretically the eigenmodes and the stability of one and two arbitrary fractional vortices pinned at one and two κ phase discontinuities in a long Josephson junction. In the particular case of a single κ discontinuity, a vortex is spontaneously created and pinned at the boundary between the 0 and κ regions. In this work we show that only two of four possible vortices are stable. A single vortex has an oscillatory eigenmode with a frequency within the plasma gap. We calculate this eigenfrequency as a function of the fractional flux carried by a vortex. For the case of two vortices, pinned at two κ discontinuities situated at some distance a from each other, splitting of the eigenfrequencies occurs. We calculate this splitting numerically as a function of a for different possible ground states. We also discuss the presence of a critical distance below which two antiferromagnetically ordered vortices form a strongly coupled “vortex molecule” that behaves as a single object and has only one eigenmode. 
Item Type:  Article 
Copyright:  © 2005 The American Physical Society 
Faculty:  Electrical Engineering, Mathematics and Computer Science (EEMCS) 
Research Group:  
Link to this item:  http://purl.utwente.nl/publications/53369 
Official URL:  http://dx.doi.org/10.1103/PhysRevB.71.104518 
Export this item as:  BibTeX EndNote HTML Citation Reference Manager 
Repository Staff Only: item control page
Metis ID: 226012