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Baryonic Bound State of Vortices in Multicomponent Superconductors · Around

2010

Baryonic Bound State of Vortices in Multicomponent Superconductors

Nitta, Muneto, Eto, Minoru, Fujimori, Toshiaki et al.

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We construct a bound state of three 1/3-quantized Josephson coupled vortices in three-component superconductors with intrinsic Josephson couplings, which may be relevant with regard to iron-based superconductors.

We find a Y-shaped junction of three domain walls connecting the three vortices, resembling the baryonic bound state of three quarks in QCD.
The appearance of the Y-junction (but not a Delta-junction) implies that in both cases of superconductors and QCD, the bound state is described by a genuine three-body interaction (but not by the sum of two-body interactions).
We also discuss a confinement/deconfinement phase transition.

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1/3-quantized vortices with 1/3 circulation exist in multicomponent superfluids such as a spinor Bose-Einstein condensate [ 15 ] and color superconductors of high-density QCD [ 16 ] . Vortices with fractional flux have also been studied in supersymmetric gauge theories [ 17 ] where no static force exists between vortices

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