Spectroscopy of a fractional Josephson vortex molecule
- Kienzle, U.
- Meckbach, J.
- Buckenmaier, K.
- Gaber, T.
- Sickinger, H.
- Kaiser, C.
- Ilin , K.
- Siegel, M.
- Koelle, D.
- Kleiner, R.
- Goldobin, E.
DOIAbstract
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 ...
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