English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Spectroscopy of a fractional Josephson vortex molecule

MPS-Authors
There are no MPG-Authors in the publication available
External Resource
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Kienzle, U., Meckbach, J., Buckenmaier, K., Gaber, T., Sickinger, H., Kaiser, C., et al. (2012). Spectroscopy of a fractional Josephson vortex molecule. Physical Review B, 85(1): 014521, pp. 1-8. doi:10.1103/PhysRevB.85.014521.


Cite as: http://hdl.handle.net/21.11116/0000-0001-8A9A-6
Abstract
In long Josephson junctions with multiple discontinuities of the Josephson phase, fractional vortex molecules are spontaneously formed. At each discontinuity point a fractional Josephson vortex carrying a magnetic flux |Φ|<Φ0, where Φ0≈2.07×10−15 Wb is the magnetic flux quantum, is pinned. Each vortex has an oscillatory eigenmode with a frequency that depends on Φ/Φ0 and lies inside the plasma gap. We experimentally investigate the dependence of the eigenfrequencies of a two-vortex molecule on the distance between the vortices, on their topological charge ℘=2πΦ/Φ0, and on the bias current γ applied to the Josephson junction. We find that, with decreasing distance between vortices, a splitting of the eigenfrequencies occurs that corresponds to the emergence of collective oscillatory modes of both vortices. We use a resonant microwave spectroscopy technique and find good agreement between experimental results and theoretical predictions.