R Walser et al 2008 New J. Phys. 10 045020 doi:10.1088/1367-2630/10/4/045020
Semifluxons in superconductivity and cold atomic gases
Focus on Quantum Correlations in Tailored MatterR Walser1,3, E Goldobin2, O Crasser1, D Koelle2, R Kleiner2 and W P Schleich1
Show affiliationsPart of Focus on Quantum Correlations in Tailored Matter
Josephson junctions (JJs) and junction arrays are well-studied devices in superconductivity. With external magnetic fields one can modulate the phase in a long junction and create traveling, solitonic waves of magnetic flux, called fluxons. Today, it is also possible to devise two different types of junctions: depending on the sign of the critical current density 
, they are called 0- or π-junctions. In turn, a 0–π junction is formed by joining two of these junctions. As a result, one obtains a pinned Josephson vortex of fractional magnetic flux, at the 0–π boundary. Here, we analyze this arrangement of superconducting junctions in the context of an atomic bosonic quantum gas, where two-state atoms in a double well trap are coupled in an analogous fashion. There, an all-optical 0–π JJ is created by the phase of a complex valued Rabi frequency and we derive a discrete four-mode model for this situation, which qualitatively resembles a semifluxon.
- PACS
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74.25.Qt Vortex lattices, flux pinning, flux creep
74.81.Fa Josephson junction arrays and wire networks
74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects
- Subjects
- Dates
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Issue 4 (April 2008)
Received 21 December 2007
Published 30 April 2008
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Semifluxons in superconductivity and cold atomic gases
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FOCUS ON HIGH ENERGY COSMIC RAYS
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