A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Wildeman, Real-time quantitative Schlieren imaging by fast Fourier demodulation of a checkered backdrop.Experiments in Fluids59(6), 97 (2018)
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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.