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Topological excitations in Chern-Simons (CS) gauge theories which describe the double-layer fractional quantum Hall effect are studied. We shall consider the generic (m, m, n) Halperin state. There are two types of solitons; one is the vortex type excitation which has essentially the same structure with the quasi-hole excitation in the single-layer case. The other is the non-trivial pseudospin...
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