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Explicit Gauge Fixing for Degenerate Multiplets: A Generic Setup for Topological Orders
We supply basic tools for the study of the topological order of a multiplet
which is an eigenspace of a finite-dimensional normal operator with continuous
parameters. We allow intrinsic degeneracies within the multiplet where a
well-known standard procedure does not work. As an important example, we give
novel expressions for a spin Hall conductance for unitary superconductors with
equal spin pairing. Generic topological orders will be treated in this unified
manner particularly with nontrivial topological degeneracies.Comment: Almost final version. (Topological) Degeneracy is stresse