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28 March 2024
 
  » arxiv » 1110.4229

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Spectroscopy of a fractional Josephson vortex molecule
U. Kienzle ; J. M. Meckbach ; K. Buckenmaier ; T. Gaber ; H. Sickinger ; Ch. Kaiser ; K. Ilin ; M. Siegel ; D. Koelle ; R. Kleiner ; E. Goldobin ;
Date 19 Oct 2011
AbstractIn 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 $|Phi|<Phi_0$, $Phi_0approx 2.07 imes 10^{-15}$ Wb being the magnetic flux quantum, is pinned. Each vortex has an oscillatory eigenmode with a frequency that depends on $Phi/Phi_0$ 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 $wp=2piPhi/Phi_0$ and on the bias current $gamma$ 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.
Source arXiv, 1110.4229
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