Topological spin Hall states, charged skyrmions, and superconductivity in two dimensions

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Similar ideas are independently being pursued by others in the context of bilayer quantum Hall systems (G. Murthy, private communication)
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Note that a Hopf term will also be generated in the large mass expansion; however its coefficient is θ = π N f \theta=\pi N_{f} where N f N_{f} is the number of species of fermions [ 8 ] and N f = 2 N_{f}=2 here. It can therefore be dropped for the subsequent discussion. In particular the skyrmion statistics will be bosonic
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