A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Kim,et al., Synthesis and dynamic switching of surface plasmon vortices with plasmonic vortex lens.Nano Lett10(2), 529–36 (2010)
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Linking extended vector wave fields with momentum space topology
A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.