Fractional Josephson vortices: oscillating macroscopic spins

Gaber, T; Buckenmaier, K; Koelle, D; Kleiner, R; Goldobin, E

doi:10.1007/s00339-007-4188-1

Item

ITEM ACTIONSEXPORT

Add to Basket

Local TagsRelease HistoryDetailsSummary

Released

Journal Article

Fractional Josephson vortices: oscillating macroscopic spins

MPS-Authors

There are no MPG-Authors in the publication available

External Resource

https://link.springer.com/article/10.1007/s00339-007-4188-1
(Publisher version)

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

Fulltext (public)

There are no public fulltexts stored in PuRe

Supplementary Material (public)

There is no public supplementary material available

Citation

Gaber, T., Buckenmaier, K., Koelle, D., Kleiner, R., & Goldobin, E. (2007). Fractional Josephson vortices: oscillating macroscopic spins. Applied Physics A, 89(3), 587-592. doi:10.1007/s00339-007-4188-1.

Cite as: https://hdl.handle.net/21.11116/0000-000A-1C1B-A

Abstract

Fractional Josephson vortices carry a magnetic flux Φ, which is a fraction of the magnetic flux quantum Φ0≈2.07×10-15 Wb. We consider a fractional vortex which spontaneously appears at a phase discontinuity. Its properties are very different from the properties of the usual integer fluxon. In particular, a fractional vortex is pinned and may have one of two possible polarities – just like a usual spin 1/2 particle. The fractional vortex may also oscillate around its equilibrium position with an 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 Φ and on the bias current. The experimental results are in good agreement with theoretical predictions. Positive result of this experiment is a cornerstone for further investigation of more complex fractional vortex systems such as fractional vortex molecules and tunable bandgap materials.