Spectroscopy of the fractional vortex eigenfrequency in a long Josephson 0-kappa junction
arXiv:cond-mat/0610043 · doi:10.1103/PhysRevLett.98.117006
Abstract
Fractional Josephson vortices carry a magnetic flux Phi, which is a fraction of the magnetic flux quantum Phi_0 ~ 2.07x10^{-15} Wb. Their properties are very different from the properties of the usual integer fluxons. In particular, fractional vortices are pinned and have an oscillation eigenfrequency which is expected to be within the Josephson plasma gap. Using microwave spectroscopy, we investigate the dependence of the eigenfrequency of a fractional Josephson vortex on its magnetic flux and on the bias current. The experimental results are in good agreement with the theoretical predictions.
submitted to PRL
References in corpus (10)
- 0-pi Josephson tunnel junctions with ferromagnetic barrier
- Dynamics of semifluxons in Nb long Josephson 0-pi junctions
- Semi-fluxons in long Josephson 0-pi-junctions
- Ground state and bias current induced rearrangement of semifluxons in 0-pi long Josephson junctions
- Quantum tunneling of semifluxons
- Ground states of one and two fractional vortices in long Josephson 0-kappa-junctions
- Analytical analysis of ground states on 0- long Josephson junctions
- Fluxon-semifluxon interaction in an annular long Josephson 0-pi-junction
- Controllable plasma energy bands in a 1D crystal of fractional Josephson vortices
- Oscillatory eigenmodes and stability of one and two arbitrary fractional vortices in long Josephson 0-kappa-junctions