A momentum-space linking number is a Berry-phase topological invariant for aperiodic Helmholtz-decomposable vector wave fields.
Janoschka,et al., Implementation and operation of a fiber-coupled CMOS detector in a low energy electron Microscope.Ultramicroscopy221, 113180 (2021)
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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.