Vortex graphs as N-omers and skyrmions in N-component Bose-Einstein condensates
1 Department of Physics, Yamagata University - Yamagata 990-8560, Japan
2 Department of Physics, and Research and Education Center for Natural Sciences, Keio University Hiyoshi 4-1-1, Yokohama, Kanagawa 223-8521, Japan
Received: 28 June 2013
Accepted: 18 September 2013
Stable vortex N-omers are constructed in coherently coupled N-component Bose-Einstein condensates. We classify all possible N-omers in terms of the mathematical graph theory and numerically construct all graphs for . We also find that N-omers are well described as skyrmions when inter-component and intra-component couplings are U(N) symmetric, and we evaluate their size dependence on the Rabi coupling.
PACS: 03.75.Lm – Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations / 03.75.Mn – Multicomponent condensates; spinor condensates
© EPLA, 2013