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  Spectroscopy of a fractional Josephson vortex molecule

Kienzle, U., Meckbach, J., Buckenmaier, K., Gaber, T., Sickinger, H., Kaiser, C., et al. (2012). Spectroscopy of a fractional Josephson vortex molecule. Physical Review B, 85(1): 014521, pp. 1-8. doi:10.1103/PhysRevB.85.014521.

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 Creators:
Kienzle, U, Author
Meckbach, JM, Author
Buckenmaier, K1, Author              
Gaber, T, Author
Sickinger, H, Author
Kaiser, C, Author
Ilin , K, Author
Siegel, M, Author
Koelle, D, Author
Kleiner, R, Author
Goldobin, E, Author
Affiliations:
1Physikalisches Institut–Center for Collective Quantum Phenomena and their Applications in LISA+, Universität Tübingen, ou_persistent22              

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 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 |Φ|<Φ0, where Φ0≈2.07×10−15 Wb is the magnetic flux quantum, is pinned. Each vortex has an oscillatory eigenmode with a frequency that depends on Φ/Φ0 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 ℘=2πΦ/Φ0, and on the bias current γ 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.

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 Dates: 2012-01
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.85.014521
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 85 (1) Sequence Number: 014521 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008