A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Gbur, Fractional vortex Hilbert’s Hotel.Optica3(3), 222–225 (2016)
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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.