A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Spektor,et al., Mixing the Light Spin with Plasmon Orbit by Nonlinear Light-Matter Interaction in Gold.Physical Review X9(2), 021031 (2019)
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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.