Stable vortex loops in two-species BECs
  We consider the creation of stable, stationary closed vortex loops, analogue to the vortons and superconducting cosmic strings, in cold atom BEC's. We explore the parameter region where these solutions are likely to exist and comment on methods to create them experimentally. 
Paulo F. Bedaque, Evan Berkowitz and Srimoyee Sen
cond-mat.quant-gas nucl-th