We propose a mechanism to create a vorton or three-dimensional skyrmion in
phase-separated two-component BECs with the order parameters Psi_1 and Psi_2 of
the two condensates. We consider a pair of a domain wall (brane) and an
anti-domain wall (anti-brane) stretched by vortices (strings), where the Psi_2
component with a vortex winding is sandwiched by two domains of the Psi_1
component. The vortons appear when the domain wall pair annihilates.
Experimentally, this can be realized by preparing the phase separation in the
order Psi_1, Psi_2 and Psi_1 components, where the nodal plane of a dark
soliton in Psi_1 component is filled with the Psi_2 component with vorticity.
By selectively removing the filling Psi_2 component gradually with a resonant
laser beam, the collision of the brane and anti-brane can be made, creating
vortons.Comment: 12 pages, 13 figures, published versio
