Spectroscopy of the fractional vortex eigenfrequency in a long Josephson 0-kappa junction

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 $\Phi$ and on the bias current. The experimental results are in good agreement with the theoretical predictions.

arXiv commentsubmitted to PRL

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Cited by in corpus (10)

• Visualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 and πsegments
• Semifluxon molecule under control
• Theory of fractional vortex escape in a 0-kappa long Josephson junction
• Sub-μm Josephson Junctions for Superconducting Quantum Devices
• Effective model for a short Josephson junction with a phase discontinuity
• Thermal escape of fractional vortices in long Josephson junctions
• Spectroscopy of a fractional Josephson vortex molecule
• Existence and stability analysis of finite 0-$\pi$-0 Josephson junctions
• Quantum tunneling of a single semifluxon in a 0-pi Josephson junction
• Breathing modes of long Josephson junctions with phase-shifts