Baryonic Bound State of Vortices in Multicomponent Superconductors

Abstract

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.

11 pages, 3 figures, one section on confinement/deconfinement transition added, published version

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• Vortex graphs as N-omers and CP(N-1) Skyrmions in N-component Bose-Einstein condensates
• Emergent Potts Order in a Coupled Hexatic-Nematic XY model
• Vortex molecules in Bose-Einstein condensates
• Ginzburg-Landau analysis of the critical temperature and the upper critical field for three-band superconductors
• Vortex polygons and their stabilities in Bose-Einstein condensates and field theory
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• Topological confinement of vortices in two-flavor dense QCD
• Core structures of vortices in Ginzburg-Landau theory for neutron ${}^3{P}_2$ superfluids
• Chemical bonds of two vortex species with a generalized Josephson term and arbitrary charges
• Proximity effects of vortices in neutron ${}^3{P}_2$ superfluids in neutron stars: Vortex core transitions and covalent bonding of vortex molecules
• Stabilizing semilocal strings by polarization