Magnetic monopoles in a charged two-condensate Bose-Einstein system
  We propose that a charged two-condensate Bose system possesses point-like topological defects which can be interpreted as magnetic monopoles. By making use of the $\phi$-mapping theory, the topological charges of these magnetic monopoles can be expressed in terms of the Hopf indices and Brouwer degree of the $\phi$-mapping. 
Ying Jiang