Abstract
We study interfacial topological defects called boojums, a vortex ending or a connecting point of two kinds of vortex cores, in rotating two-component Bose-Einstein condensates. First, we show that the boojum exists at a vortex ending that connects to the interface of the strongly phase-separated condensates. Next, we study various boojums appearing between two phases characterized by different vortex structures, where the intercomponent s-wave scattering lengths are spatially varied. Using three-dimensional simulations of the Gross-Pitaevskii equations, we reveal the detailed structure of the boojums by visualizing its density distribution and effective superflow vorticity.
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Kasamatsu, K., Takeuchi, H., Nitta, M. et al. Connection of Vortices Between Spatially Different Phases in Two-Component Bose-Einstein Condensates. J Low Temp Phys 158, 99–104 (2010). https://doi.org/10.1007/s10909-009-9985-9
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DOI: https://doi.org/10.1007/s10909-009-9985-9