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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 | 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
$|Phi|<Phi_0$, $Phi_0approx 2.07 imes 10^{-15}$ 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 | Services: | Forum | Review | PDF | Favorites |
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